1. Twenty high school students were asked how many hours they worked on a particular homework assignment. The answers are summarized in the table below:

Hours Worked: 0 1 2 3 4

Frequency: 4 12 1 1 2

a)Find the inter quartile range of the number of hours worked.

(A) 0

(B) 1

(C) 1.5

(D) 2

(E) 2.5

b)Find the sample standard deviation of the number hours studied.Choose the alternative closest to your answer.

(A) 1.16

(B) 1.36

(C) 1.58

(D) 3.12

(E) 4.63