' . Normal No Spacing Heading 1 3. Given a normal distribution of values for which the mean is 70 and the standard deviation is 5, use the table at the end of this exercise to find: a) the probability that a value is between 65 and 75, inclusive. b) the probability that a value is greater than or equal to 75 c) the probability that a value is less than 62. Answer to a): Answer to b): Answer to c): The lifetime of a battery is normally distributed with a mean life of 40 hours and a standard deviation of 1.5 hours. Use the table at the end of this exercise to determine the probability that a randomly selected battery lasts longer than 42 hours. (Hint: remember that the normal distribution is symmetricall 4. Answer: 5. In a region of Ohio, the average electric bill in July follows a normal distribution with a mean of $200 and the standard deviation of $50. In a group of 500 customers, how manv would vou expect to have a bill that is $150 or less? E Focus