Question

A student has the following grades: 86, 80, 79, 85, 70. Find the standard deviation of the grades. 1) 40.5
2) 5.69
3) 32.4
4) 1640.5

Answer 1

First thing first, can you find the mean?

Answer 2

then ( xi - mean)² ,
then do Sum of these square,
Finally divide by n terms!

Answer 3

2) 5.69

Answer 4

Have you squared the difference?

Answer 5

yeah32.4

Answer 6

Yup! Great job =)

Answer 7

Adult IQ scores have a bell-shaped distribution with a mean of 100 and a standard deviation of 15. Use the Empirical Rule to find the percentage of adults with scores between 85 and 115.

Answer 8

Open the new post, will you!