The U.S. Department of Transportation reported recently that all commuters in the New York City area average 120 minutes on the road travelling to and from work each workday. Assume that the standard deviation for the amount of time all commuters in the New York City area travel to and from work each workday equals 30 minutes. a) If a random sample of 36 commuters in the New York City area is selected calculate

The U.S Navy requires that fighter pilots have heights between 64 inches and 74 inches. The Men’s are normally distributed with a mean of 68.6 inches andthe standard deviation of 2.8 inches. a) Find the percentage of men meeting the height requirement b) If the Air Force height requirements are changed to exclude only the tallest 4% and the shortest 4% of men, what are the new height requirements?

On May 16, 2017, Verdun Hayes of Somerset, Great Britain set a new Guinness World Record: the oldest ever skydiver. The World War II veteran, who fought on the beaches of Normandy in 1944, set a new record when he skydived at age 101. Suppose the ages of all skydivers follow a normal distribution with mean 47.8 years and standard deviation 12.6 years. Based on this distribution, how old must a skydiver be to fall in the top 2.62% of the distribution? 29.931 75.669 75.033 72.242 Previous C 4 Address Next

A recent report indicated a typical family spend $650 per month on food. Assume the distribution of food expenditures for a family of five follows a normal distribution, with mean of $650 and standard deviation of $120. A sample of 64 is taken. a) What percentage of the families spends more than $675 per month on food? b) What percentage of the families spends less than $660 per month on food? c) What percentage of the families spends between $660 and $670 per month on food? d) What percentage of the families spends less than $650 or more than $675 per month on

The mean value of land and building per acre from a sample of farms is $1400 with a standard deviation of $300. The data set has a bell shaped distribution. Assume the number of farms in the sample is 71. A) Use the empirical rule to estimate the number of farms whose land and building values per acre are between $800 snd $2000. B) If 25 additional farms were sampled , about how many of these additional farms would you expect to have a land and building values between $800 and $2000?