The owner of a fast-food restaurant knows that, on average, 2.4 cars (customers) use the drive-through window between 3 pm and 3.15 pm. Find the variance and standard deviation Find the probability...

The owner of a fast-food restaurant knows that, on average, 2.4 cars (customers) use the drive-through window between 3 pm and 3.15 pm.

1. Find the variance and standard deviation


2. Find the probability that exactly two cars will use the drive-through window


3. Find the probability that at least three cars will use the drive-through window