# Question: In October 2012 Apple introduced a much smaller variant of

In October 2012, Apple introduced a much smaller variant of the Apple iPad, known as the iPad Mini. Weighing less than 11 ounces, it is about 50% lighter than the standard iPad. Battery tests for the iPad Mini showed a mean life of 10.25 hours (The Wall Street Journal, October 31, 2012). Assume that battery life of the iPad Mini is uniformly distributed between 8.5 and 12 hours.

a. Give a mathematical expression for the probability density function of battery life.

b. What is the probability that the battery life for an iPad Mini will be 10 hours or less?

c. What is the probability that the battery life for an iPad Mini will be at least 11 hours?

d. What is the probability that the battery life for an iPad Mini will be between 9.5 and 11.5 hours?

e. In a shipment of 100 iPad Minis, how many should have a battery life of at least 9 hours?

a. Give a mathematical expression for the probability density function of battery life.

b. What is the probability that the battery life for an iPad Mini will be 10 hours or less?

c. What is the probability that the battery life for an iPad Mini will be at least 11 hours?

d. What is the probability that the battery life for an iPad Mini will be between 9.5 and 11.5 hours?

e. In a shipment of 100 iPad Minis, how many should have a battery life of at least 9 hours?

## Answer to relevant Questions

A Gallup Daily Tracking Survey found that the mean daily discretionary spending by Americans earning over $90,000 per year was $136 per day (USA today, July 30, 2012). The discretionary spending excluded home purchases, ...Given that z is a standard normal random variable, find z for each situation.a. The area to the left of z is .9750.b. The area between 0 and z is .4750.c. The area to the left of z is .7291.d. The area to the right of z is ...The American Automobile Association (AAA) reported that families planning to travel over the Labor Day weekend would spend an average of $749 (The Associated Press, August 12, 2012). Assume that the amount spent is normally ...The Boston Fire Department receives 911 calls at a mean rate of 1.6 calls per hour (Mass.gov website, November 2012). Suppose the number of calls per hour follows a Poisson probability distribution.a. What is the mean time ...A machine fills containers with a particular product. The standard deviation of filling weights is known from past data to be .6 ounce. If only 2% of the containers hold less than 18 ounces, what is the mean filling weight ...Post your question