Question

1. The scores from a statistics test were

99, 60, 82, 78, 93, 71, 68, 86, 80, 95, 72, 64
a. Calculate the mean and standard deviation for the class
(to the nearest whole number)
b. Drawn and label the normal distribution curve,
and
c. 68% of the students have a test score between
and
d. 95% of the students have a test score between
e. What percentage of the students scored less than a 792
f. What percentage of the students scored between a 55 and a 912

Answer 1

Mean=79 it’s just a step by step

Answer 2

Mean = 79

Explanation:

99 + 60 + 82 + 78 + 93 + 71 + 68 + 86 + 80 + 95 + 72 + 64

Then divide by 12 because that's the total of numbers there are.

So 948 / 12 = 79