1. The exam scores of 19 students are as follow:
76, 74, 82, 96, 66, 76, 78,72, 52, 68,
86, 84, 62, 76, 78, 92, 82, 74, 88
a. Prepare a frequency distribution.
b. Draw a stem-and-leaf plot.
c. Construct a histogram with a class width of 1 and 5.
d. Based on (a.) do you think a grouped frequency distribution is better than a simple frequency distribution? Please explain your answer.

A student scores 50 on a psychology exam and 83 on an economics exam. The psychology exam has a mean score of 60 and the standard deviation of 5. The economics exam has a mean score of 80 and a standard deviation of 10. Find the z-score for each test and decide which examscore is relatively better.
What is the z-score for th

1. For a sample with a mean of M=45, a score of X=59 corresponds to z=2.00. What is the sample standard deviation?
2. In a population of examscores, a score of X=48 corresponds to z=+1.00 and a score of X=36 corresponds to z=-0.50. Find the mean and standard deviation for the population.
3. For each of the following popul

Question:
The following stem and leaf display represents the final examscores for a class of 25 literature students:
[Please refer to the attachment for the figure]
a. Convert the stem and leaf display into a frequency distribution, using a lower limit for the first class of 20 and a class width of 15. Complete the followi

For a particular sample of 50 scores on a psychology exam, the following results were obtained.
First quartile = 67 Third quartile = 91 Standard deviation = 9 Range = 48
Mean = 75 Median = 80 Mode = 81 Midrange = 74
a)What score was earned by more students than any other score? Why?
b)How many students scored b

Misery loves company. It is time for the PE (professional engineer's exam). The results of the national test were normally distributed around the mean score of 70. A score of 60 points was a passing score. Since I know someone the knows someone, I found out that my score was 80 and I rated in the 80 percentile (bottom of the top

We expect that students who do well on the midterm exam in a course will usually also do well on the final exam. Gary Smith of Pomona College looked at the examscores of all 346 students who took his statistics class over a 10-year period. *The least-squares line for predicting final examscore from midterm examscore was
y

On a test whose distribution is approximately normal with a mean of 50 and a standard deviation of 10, the results for three students were reported as follows:
Student Opie has a T-score of 60.
Student Paul has a z-score of -1.00.
Student Quincy has a z-

#1
With regards to a standard normal distribution complete the following:
(a) Find P(z < 0), the percentage of the standard normal distribution below the z-score of 0.
(b) Find P(z < 1.65), the percentage of the standard normal distribution below the z-score of 1.65
(c) Find P(-3 < z

1. The following are marks obtained by a group of 40 students on an English examination:
42 88 37 75 98 93 73 62
96 80 52 76 66 54 73 69
83 62 53 79 69 56 81 75
52 65 49 80 67 59 88 80
44 71 7