16) Jessica Salas, president of Salas Products, is reviewing the warranty policy for her company's new model of automobile batteries. Life tests performed on a sample of 100 batteries indicated: (1) an average life of 75 months, (2) a standard deviation of 5 months, and (3) a bell shaped battery life distribution. What percentage of the batteries will fail within the first 65 months of use?
a) 0.5% b) 1% c) 2.5% d) 5% e) 7.5%
17) The ages of students in a class have been put into the frequency distribution below.
Age Number of Students
18 3
19 5
20 28
21 4
What is the average age of these students?
a) 19.50 b) 19.83 c) 20.00 d) 22.00 e) 23.00
18) The ages of students in a class have been put into the frequency distribution below.
Age Number of Students
18 3
19 5
20 28
21 4
What is the standard deviation for this (population) set of data?
a) 0.494 b) 0.703 c) 1.12 d) 1.25 e) 1.35
19) The following box and whisker plot was constructed for the age of accounts receivable.
The box and whisker plot reveals that the accounts receivable ages are ____.
a) skewed to the left b) skewed to the right c) not skewed d) normally distributed e) symmetrical