Question

15.A box contains five red balls, three green balls, and two yellow balls. Suppose you select one ball at random from the box and do not replace it. Then you randomly select a second ball. Find the probability that both balls selected are red.

16. In a certain region, the probability of flooding in any one year is 1/4. What is the probability that it does NOT flood at all over the next five years?

17. Consider the following scores on a ten-point exam: 4, 7, 9, 6, 7, 2, 6, 3, 8, 7, 5, 3, 5, 8, 4, 4

(a) Construct a frequency distribution.

(b) Construct a histogram.

(c) Construct a frequency polygon.

18. Consider the following 30 scores from a 100-point exam: 79, 51, 67, 50, 78, 62, 79, 83, 73, 80, 88, 48, 60, 71, 79, 89, 63, 55, 93, 71, 41, 81, 46, 50, 61, 59, 50, 80, 75, 61

(a) Construct a stem-and-leaf display.

(b) Construct a grouped frequency distribution with classes 40-49, 50-59, etc.

(c) Construct a grouped histogram for the frequency distribution

Answer 1