Homework #3

1) Between a z-score of .27 and the mean

2) Between a z-score of 1.07 and the mean

3) At or above a z-score of 1.17

4) At or below a z-score of 1.17

5) At or below a z-score of -1.57

6) At or above a z-score of -1.77

7) Between the z-scores of -1.05 and .57

8) Between the z-scores of 1.05 and .27

9) Between the z-scores of 1.25 and .57

10)

We release 10 balloons. There is a 70% chance they will reach Baltimore.

Quarry Harris releases 12. What is the probability that exactly 9 balloons

will reach New York?

11)

When people were shown pictures of Madonna, 95% of them

recognized her. Find the probability that among 12 randomly selected

people, exactly 10 will recognize Madonna.

12)

Crystal just learned to play basketball. On average she can land 25% of her free throws. Assume she shoots 10 free throws. Find the probability that she can land at least 1 of the 10 free throws.