True or False

Decide whether the following questions are true or false.

1. If the time to wait for pharmacy help has a uniform distribution from 0 minutes to 30 minutes, then 33% of the customers are expected to wait more than 20 minutes.

True False

2. If X has a Binomial (50, 0.7) distribution, then the criteria to use the normal approximation are met.

True False

3. 68% of all test scores will fall within one standard deviation of the mean test score.

True False

4. Policereportthat78%ofdriversstoppedonsuspicionofdrunkdrivingaregivenabreathtest, 36%aregivenabloodtestand 22%aregivenbothtests. Do thepoliceadministerthesetwo tests independently? Justify your answer with a calculation.

True False