A certain brand of refrigerator has a lenght of life that is normally distributed with a mean and a standard deviation of 5 years and 2 years respectively. In addition to providing the answer, state the relevant Excel commands.
a) What is the probability a refrigerator will last less than 6.5 years more?
b) what is the probability that a refrigerator will last more than 23 years?
c) What lenght of life should the retailer advertise for these refrigerators so that only 3% of the refrigerators fail before the advertised lenght of life?
2. First introduced in Los Angeles, the concept of Korean style tacos sold from a catering truck has been gaining popularity nationally. This taco is an interesting mix of corns tortillas with korean style beef, gainished with onion, cilantro and a hash of chill-soy-dressed lettuce. Suppouse one such taco truck operates in the detroit area. The owners have estimated that the daily consumption of beef is normally distributed with a mean of 24 punds and a standar deviation of 6 pounds. While purchasing too much beef results in wastage, purchasing too little can disappoint customers.
a) Determine the amount of of beef the owners should buy so that it meets demand on 80% of the days.
b) How much should be the owners buy if they want to meet demand on 95% of the days?