Helga scored in the 70th percentile rank on an exam. If 300 students took the exam, how many students scored lower than Helga?

Q: Al gave correct answers to 47 of the 50 questions on the driving test . What percentage of the…

A: We can give the correct answer in the below st

Q: If there were 760 students in Jamal’s class, approximately how many students scored higher than…

A: The probability that z-score is greater than 1.41 is calculated as follows: PZ>1.41=1-PZ≤1.41…

Q: On a test, a student got 80% of the items correct. If the Student got 56 items correct, how many…

A: Let x be the items on the test given: 80% of x is 56

Q: A group of students were surveyed about the number of siblings they have. The frequencies and…

A: Solution: From the given information, the table of frequencies and relative frequencies of their…

Q: In​ Lindsay's class, there were three students who scored 80 on a test and six students who scored…

A:

Q: A certain test is worth125 points. How many points (rounded to the nearest point) are needed to…

A: A certain test is worth125 points.

Q: Sally just received her SAT results. Her SAT mathematics score was 600 and is in the 74th…

A: The score is 600 and it is the 74th percentile.

Q: Of 60 patients treated with a certain medication, 24 showed no improvement. What percent of patients…

A: Total patient=60 Patient who showed no improvement=24 To calculate: what percent of patients…

Q: Yosef bought an assortment of socks. 5/7 of the socks were orange. 1/4 of the remaining socks were…

A: Fraction:  It is a small  part of  something or, In other words, a numerical value  that is not a…

Q: 00 subjects were studied and 120 of them expressed a preference for brand x, what percentage…

A: The 200 subjects were studied; n=200 120 of them expressed a preference for brand x; x=120

Q: in a survey 7 out of 8 people liked cooking over washing dishes what percent liked cooking more

A: As per question, we need to find how much percentage liked cooking more. So, we need to find both…

Q: In a survey of middle school students, 70% play basketball and 40% play basketball and football. Of…

A:

Q: Four out of five students got As in math. What percent of students got As in math?

A: From the Percentages

Q: In a survey of 1,700 people who onwed a certain type of car 595 said that they would buy that type…

A: In a survey of 1,700 people who onwed a certain type of car 595 said that they would buy that type…

Q: A survey of 150 people revealed that 115 people like ketchup on their hot dogs, 85 people like…

A: Concept of General Addition Rule: For any two events A and B the General Addition Rule state that:

Q: A student gets 9 out of 15 problems correct on a homework assignment. What percent of the assignment…

A: The objective of this question is to find out the percentage of the assignment that the student got…

Q: Of the 328 patients that completed the survey last year, 211 of them claimed to be returning…

A: Given: 328 patients completed the survey 211 patients returning

Q: Eight hundred student took a 90-point standardized examination. After the examination, the students…

A:

Q: f the score of 3 courses for a student who studied at a university are 81, 62, 74 with credit hours…

A: Solution: The scores of three courses for a students are  X= 81, 62 and 74 The credit hours  that is…

Q: Two math workshops were organized by the Math club of the school. The first workshop was attended by…

A: The operator "∩" denotes the intersection of sets. For example: A∩B denotes the set which contains…

Q: In a survey of 1536 adults, 36% responded "yes" to the survey question. How many adults answered…

A: From the provided information, Sample size (n) = 1536 36% responded “Yes” to the survey question.…

Q: 31 of 48% is what?

A: 31 of 48%

Q: Out of 32 students in a class 5 said they ride their bike to school. Based on these results how many…

A: Unitary method : It is a method by  first determine the value of single unit and then determine the…

Q: cently a community college offered a 2-credit course to help students with math anxiety. At the…

A: Calculate the following values: Before(x) After(y) x2 y2 x*y 72 69 5184 4761 4968 66 52 4356…

Q: You survey 100 people and find that 75 of them would prefer to work at home to some extent. When…

A: Given: You survey 100 people and find that 75 of them would prefer to work at home to some extent.…

Q: In a survey of 1150 adult males, 805 said they use the Internet. In a survey of 1050 females, 746…

A: There are two dependent variables which are males and females. The independent variable is using of…

Q: There were more than 24 glasses, but less than 100 glasses. If the glasses were in rows of 6, there…

A:

Q: 30% of Grandpa Neil's stamps have images of flags on them. If he has 75 flag stamps, how many stamps…

A: In question, Given that 30% of Grandpa Neil's stamps have images of flags on them. If he has 75 flag…

Q: In Music, Linda scored 70%, and her score was at the 85th percentile.  In Art, Linda scored 95%,…

A: It is given that the stated person's scores (in percentage) in Music and Art are 70% and 95%…

Q: On a test, John scored at the 50th percentile and Jim scored at the 25th percentile; therefore,…

A: A percentile indicates a score's position in relation to those other values from the same dataset.…

Q: 15. An experiment was designed to test whether or not students can tell the difference between tap…

A: In this experiment we are going to test whether or not students can tell the difference between tap…

Q: a reading test. Shaylen's score of 455 was higher than the scores of 4276 of the 7212 students who…

A: Given a reading test, Shaylan's score of 455 was higher than the scores of 4276 of the 7212 students…

Q: Demetra has taken nine quizzes in an environmental conservation course, and the mean of her scores…

A: Given mean score is 77 and two lowest score which are thrown out are 62 and 64. we have to calculate…

Q: On a reading test, Shaylen's score of 455 was higher than the scores of 4278 of the 7274 students…

A: We have given a reading test score of Shaylen's = 455 Number of students who got less than 455 =4278…

Q: The proportion of commuters on PSU – Berks campus is purported to be 65%. A professor believes this…

A: Given P0=65% = 0.65 Let X = Number of commuters on PSU  X = 200 n = 300

Q: A recent year was randomly picked from 1985 to the present. In that year, there were 2,052 Hispanic…

A: Public university:Sample size Number of Hispanic students Community college:Sample size Number of…

Q: If Gena's score is 85, the class average is 82, and the SD is 4, what is Gena's Z-score?

A: If Gena's score is 85, the class average is 82, and the SD is 4, what is Gena's Z-score?

Q: A study was conducted to investigate a relationship between the colors of helmets worn by motorcycle…

A: When the given sample size is less than 30, then we use a small sample test in hypothesis testing.…

Q: Nygel answer 11 out of 12 test questions correctly. What percent of his test questions did he answer…

A:

Inverse Normal Distribution

The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.

Mean, Median, Mode

It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.

Z-Scores

A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.