Question

The durations of phone calls taken by the receptionist at an office are like draws made at random with replacement from a list that has an average of 8.5 minutes (that's 8 minutes and 30 seconds) and an SD of 3 minutes. Approximately what is the chance that the total duration of the next 100 calls is more than 15 hours?

Answer 1

Jack and Jill gamble on a roll of a die, as follows. If the die shows 1 or 2 spots, Jack gives Jill $1. If the die shows 5 or 6 spots, Jill gives Jack $1. If the die shows 3 or 4 spots, no money changes hands. Suppose Jack and Jill play this game 400 times. The chance that Jill’s net gain is more than $20 is closest to

Answer 2

pls can any one reply

Answer 3

Jack and Jill gamble on a roll of a die, as follows. If the die shows 1 or 2 spots, Jack gives Jill $1. If the die shows 5 or 6 spots, Jill gives Jack $1. If the die shows 3 or 4 spots, no money changes hands. Suppose Jack and Jill play this game 400 times. The chance that Jill’s net gain is more than $20 is closest to

Answer:
10%