The waiting time x at a fast-food restaurant during lunch time is approximately normally distributed with a mean of 4.5 min and a standard deviation of 1.2 min. Find the probability that a randomly selected customer has to wait less than 2.7 min.
Q. 2For a particular age group of adult females, the distribution of cholesterol readings, in mg/dl, is normally distributed with a mean of 180 and a standard deviation of 12. What percentage would have readings less than 156?
Q. 3For a particular age group of adult females, the distribution of cholesterol readings, in mg/dl, is normally distributed with a mean of 180 and a standard deviation of 12. What percentage of this population would have readings exceeding 210?
Q. 4Assume that x is a normally distributed random variable with a mean of 70 and a standard deviation of 10 Find P(x < 48).
Q. 5Assume that x is a normally distributed random variable with a mean of 70 and a standard deviation of 10 Find P(48 < x < 88).
Q. 6Assume that x is a normally distributed random variable with a mean of 70 and a standard deviation of 10 Find P(75 < x < 92).
Q. 7Assume that x is a normally distributed random variable with a mean of 70 and a standard deviation of 10 Find P(67 < x < 93).
Quick Reply
