Confused: Find probability 7 of 12 drivers were wearing seat belts.

[kawsarkurban]

A recent study by the American Highway Patrolman’s Association revealed that 65%of American drivers use their seatbelts. A sample of 12 drivers on major highways wasrandomly selected.

1. Find the probability that seven of the drivers are wearing seatbelts.

2. How many of the drivers would be expected to be wearing their seatbelt?

3. Calculate the standard deviation for this distribution



please help me solve this question, much appreciated.

 

[HallsofIvy]

There are two outcomes here: a driver is either wearing a seatbelt or not wearing a seatbelt. Do you know the "binomial distribution"? If not, look it up!