statistics

ENTC 4037/5037

Homework 1 08/28/2017

1. Determine the median of the following numbers:

a. 22, 11, 15, 8, 18, 7

2. Determine the mean of the following:

35, 28, 33, 38, 43, 36, 44, 55, 16

3. Determine the standard deviation for the following:

1.5, 1.2, 3.1, 1.3, 0.7, 1.8, 2.2, 2.6, 3.8, 4.9, 0.9, 1.0, 2.5, 3.3, 1.8

4. If the mean time to clean a motel room is 16 minute and the standard deviation is 1.5 minute,

a) What percentage of the rooms will take less than 13 minute to complete?

b) What percentage of the rooms will take more than 20 minute to complete?

c) What percentage of the rooms will take between 13 and 20.5 minute to complete?

The data are normally distributed.

5

5

5

15