Question

A school is sending 11 children to a camp. if 20% of the children in the school are first graders, what is the mean and standard deviation of the number of first graders going to camp? round to two decimal places.

Answer 1

Total number of students = n = 11

Proportion of first graders = p = 20% = 0.2

Explanation:

Answer 2

Total number of students = n = 11
Proportion of first graders = p = 20% = 0.2

Mean number of first graders going to camp will be = np

Using the given values, we get:

Mean = 11(0.2) = 2.20

Standard deviation can be calculated as:


`s= √(np(1-p))`

Using the values, we get:


`s= √(11(0.2)(0.8)=1.33`

Therefore, the mean will be 2.20 and standard deviation will be 1.33 of the number of first graders going to camp.