Question 4 The exam scores for a group of 780 students at Maquarie Gardens High School (MGHS) are normally distributed, with a mean score of 55 and a standard deviation of 15. (a) Complete the scale on the normal distribution graph below. 10 215% 25 6 13.54% 0.1359 x 778 0 €185.98 upper 90 lower: 60 = √5 34-13% 34.13% 40 44= 55. 55 Score 70 -106 13.39% (b) Find the number of students who would be expected to obtain a score between 70 and 85 2.15%. 85 O (c) The bottom 16% of students will be given a fail. What is the cut-off mark for a fail? therefore, approximately 106 Students Nond be expected to obtain a SCOLe between 70 85 in the group of 78 e students. (d) What is the probability of a student obtaining a score between 60 and 90? GC in put 0.13 +215+13.59 = 16%. 0-13%. 100 aa #us thus, He cut-off mark for a fan is 40. :: the probability of a student obtaining a scole between 60 pad is approximately 0.361 or $236.11.

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F1.6 Question 18 please write on paper

leave answer in calculator ready form please!

Below is data for two variables, X and Y.  Answer the questions that follow.  X Y X-MX Y-MY (X-MX)2 (Y-MY)2 (X-MX)(Y-MY) 3 3 -2 -1 4 1 2 4 3 -1 -1 1 1 ___ 6 4 1 ___ 1 0 0 7 6 2 2 ___ 4 4   What is the missing value under the (X-MX)2 column?

Below is the output from regression.  Use the p-value and decide if the equation is good to use for forecasting.    Group of answer choices A.) p-value = 82 - equation is good to use B.) p-value = 0.15 - equation is not good to use C.) p-value = 0.18 - equation is not good to use D.) p-value = -16 - equation is good to use

Students in 5 different 2nd grade classes are timed to see how long it takes to correctly answer 50 addition and subtraction problems. Each class was then taught a different strategy for basic arithmetic for one month. After the month, the students were again timed to see how long it takes to correctly answer 50 similar problems. The dot plots below show the differences in times for the students (difference after before) for each of the five classes. Which dot plot appears to indicate an improvement in time for the class? A B C D 3 -4 000 · goods goxxcomm 0 ... 8.00 88 888 8 8 8 8 。 8 88 000 0 80 800 -2 0 8 01 cooo 2 08 우 O O +-000 8 08...8.... 0 800 6 8 00 10 12

USE THE INFORMATION BELOW TO ANSWER QUESTIONS 34 THRU 37 The infant mortality rate is expressed as the number of infant deaths per 1000 live births. According to the US Central Intelligence Agency (CIA), which keeps accurate, up-to-date infant mortality statistics throughout the world, in 2019 there were 33 nations with better infant mortality rates than the United States. The US infant mortality rate of 6.22 infant deaths per 1000 live births ranked 34th. It appears that at a certain stage in nations' movement up the socioeconomic scale-after the basic necessities for infant survival (proper nutrition, sanitation, clean water, and access to health care) have been met-a counter-intuitive relationship occurs between best fit line and the number of vaccines given to infants and infant mortality rates: nations with higher (worse) infant mortality rates give their infants, on average, more vaccine doses. This positive correlation, derived from the data elicits an important inquiry: are…

Oliver and Tony work at a dentist office. They had a conversation one day about how much time it took to complete a routine cleaning for each patient. Tony wondered if the time since the last visit to the office was related to the length of a cleaning. Oliver went to the filing cabinet and came up with the following data: x = Months since last visit y = Length of cleaning (mins) 6 20 13 49 6 8 9 15 33 35 42 14 7 11 9 55 36 52 29 E SALETSTRANICZON RUSSAREN Co JINSIEMELLET

Suppose that an urban geographer is studying historical changes in housing characteristics in London, England.  She wishes to determine if house size (square feet of living area) and the number of years since home construction are associated.  What method could she use to learn if such a relationship exists.