What raw score is needed to be in the bottom  28%? A group of students take a exam and the adverage was m = 90 and the standard deviation was 7.8. Answer the questions using  raw scores, z scores and creating a curve.

Q: Americans spend an average of 5 hours per day online. If the standard deviation is 33 minutes, find…

A: Given,Mean, μ = 5 hours = 5×60 = 300 minutes.Standard deviation, σ = 33 minutes.We need to find the…

Q: Margin of Error 3. In a sample of 120 jeepneys with a standard deviation of 35km/h speed. Find the…

A: Given, sample size = 120 standard deviation = 35 confidence level = 90% Critical value for the 90%…

Q: Find the standard deviation of the lengths of the wolves in the entire animal preserve.

A: The mean of the lengths of the wolves in the entire animal preserve is,…

Q: You throw a ball as far as you can 5 times, recording the distance for each throw: 165 feet, 184…

A: since only 5 observation is given we will consider them as sample (n = 5)and population (N = 100)…

Q: Refer to the accompanying table, which describes the number of adults in groups of five who reported…

A: The data on the number of adults in a group of five are given as…

Q: The weights in ounces of newborn infants were recorded by a hospital. The weights were 88, 99, 82,…

A: Given data,   88, 99, 82, 81, 84 and 100   First find the sample mean. Mean:

Q: At McMeck High School they decided to calculate the average GPA of all 950 students.  The average…

A:

Q: IQ scores have a mean of 100 and a standard deviation of 15. What percentile corresponds to an IQ…

A: Given that Mean =100  Standard deviation =15  We have to the percentile  corresponding to an IQ…

Q: Refer to the accompanying table, which describes the number of adults in groups of five who reported…

A:

Q: A researcher measures the amount of food consumed by each dog in her lab. She finds that the mean…

A: It is given that mean amount of food is 12 oz and number of dogs is 16. The sum of squared…

Q: Pam is planning to take a SAT Prep course. She asks 7 of her older sister's friends who used a prep…

A:

Q: 5.) If you choose 50 companies, what is the probability that the percent gain of the company is…

A:

Q: The weight of football players is normally distributed with a mean of 200 pounds and a standard…

A: Given,mean(μ)=200standard deviation(σ)=25

Q: 3. The number of miles traveled per gallon of gasoline for a certain car has a mean of 25 and a…

A: Given that  Mean=25 Standard deviation =2 Sample size n=20

Q: Use the table to answer the question. Note: Round z-scores to the nearest hundredth and then find…

A: Let X be the cholesterol levels of a group of young women at a university are normally distributed,…

Q: The chloride concentration in the blood (mmol / liter) averages 104 with a standard deviation of 5.…

A: Given Data: Let X represent the random variable   X~ Normal (104, 52) n=200 Therefore, X¯ ~ Normal…

Q: If the main level of snowfall for Boston Massachusetts is 44 inches per year and the standard…

A:

Q: The average score on the Stats midterm was 70 points with a standard deviation of 6 points,…

A: Given that.   X~N( μ , ?)   μ=70    , ?=6  , Z-score = -1   Z-score =( x - μ )/?

Q: The mean weight of babies born in Central hospital last year was 7.2 pounds. Suppose the standard…

A:

Q: The rainfall in a town last year measured 31 inches. If the annual rainfall has a mean of 48.89…

A:

Q: Five hundred children participated in a field demonstration. Their heights averaged 110 cm with a…

A: Let X be a random variable such that X: Height of the children Since the sample is large (500)…

Q: Here are some of the Final Exam scores from last semester's class: 81, 77, 90, 93, 99, 88, 85, 70,…

A: Given n=12

Q: You want to know the percentage of financial services companies that earned revenue less than 8181…

A: The objective of this question is to find the percentage of financial services companies that earned…

Q: Suppose a variable is normally distributed. What percentage of scores fall between one standard…

A:

Q: Would you be able to help with Standard Deviation along with the range, mean, mode, and median?

A: Measures of variability:The measure of variability or the measures of dispersion can be measured…

Q: Laura learned that the average GPA in her school is 3.6 with a standard deviation of 0.3. If her GPA…

A: From the given information,   Mean = 3.6 Standard deviation = 0.3   The objective is to find the…

Q: The average and standard deviation for ACT scores are 20 and 3 respectively. average and standard…

A:

Q: In my Biology Class, to pass the course the minimum score must be 67. Biology class has a mean of…

A: Let, X= scores of the biology class Given that X follows a normal distribution with mean= 81 and…

Q: Given the data: 47, 55, 57, 63, 73. Find the standard deviation. Round the final answer to the…

A:

Q: Researchers measured the data speeds for a particular smartphone carrier at 50 airports. The highest…

A: Given: highest speed=74.3 mean(x)=15.94 s=22.26

Q: On a nationwide math test, the mean was 72 and the standard deviation was 7. If Roberto scored 90,…

A: Given that, Mean = 72 Standard deviation = 7

Q: Let's look at the relationship between hour Price (in thousands of dollars) and house Size (In…

A: Note: Hi! Thank you for the question. As you have posted multiple sub-parts, according to our…

Q: 4. The mean score of 100 BS Biology students on a 100-item chapter test is 92.28 using the midpoint…

A: The mean calculation for frequency distribution can be done with the following two methods  1.…

Q: ASK YOUR TEACHER   Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous…

A:

Q: The weights of men are normally with a mean of 172 pounds and a standard deviation of 29 pounds.…

A: Let X be the random variable from normal distribution with mean (μ) = 172 and standard deviation (σ)…

Q: approximately the same. A recruiting office randomly surveys 50 entry level statisticians and 50…

A: Given Information: Number of statisticians,n1=50 Mean salary of statistician, x1¯=41100 Standard…

Q: Pattys final exams have an average of 78 and a standard deviation of 6.  If she wants 4% of her…

A: X follows a Normal distribution with mean = 78 and S.D = 6 Then z=(x-mean)/SD = (x-78)/6  follows…

Q: basketball coach kept stats for his team in free throw percentage and steals (among others). At the…

A: Solution To find in which category did Erin do better compared with her team we will use z score.

Q: I am not familiar using the standard deviation formula for my statistics class

A:

Q: What would a histogram look like if the mean is 50 the median is 50 and the standard deviation is…

A: Mean is 50.Median is 50.Standard deviation is 1.6.

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.