1.To estimate the unknown probability p that a weighted coin will land heads, it is flipped at random 1,000 times and happens to land heads 737 times. We estimate p to be 737/1000. To have approximately 90% confidence, what margin of error should accompany this estimate? (Enter the error margin in decimal form to four decimal places.)

2.Under the standard normal curve, what is the area to the left of z if the central area between -z and z is 0.68? (Give the left area in decimal form. You do not need to find z here.)

1.Suppose a certain customer wait time is Exponential and the average wait time is = 14.8 minutes. If the wait began at 11:00am and it is now after 11:05am, what is the probability the customer will be finished by 11:15am? (Give the probability in decimal form to four places.)