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13. The shelf life of a particular dairy products is normally distributed with a mean of 12 days and a standard deviation of 3 days. About what percent of the products will last between 12 and 15 days? A. 2.5% В. 16% С. 34% D. 68%

13. The shelf life of a particular dairy products is normally distributed with a mean of 12 days and a standard deviation of 3 days. About what percent of the products will last between 12 and 15 days? A. 2.5% В. 16% С. 34% D. 68%

A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Choose the letter of the correct answer.Answer number 13,14 and 15.

13. The shelf life of a particular dairy products is normally distributed with a mean of 12 days and a standard deviation of 3 days. About what percent of the products will last between 12 and 15 days? . 2.5% В. 16% C. 34% D. 68% 14.The mean life of a tire is 30,000 km and the standard deviation is 2,000 km. What are the possible limits if 68% of all tires will be considered? A. 24,000 km and 34,000 km B. 26,000 km and 34,000 km C. 27,000 km and 31,000 km D. 28,000 km and 32,000 km 15.A company makes parts for a machine. The lengths of the parts must be within a certain limit or they will be rejected. A large number of parts were measured and the m an and the standard deviation were calculated as 3.1m and 0.005m, respectively. What are the limits if 99.7% of the parts were accepted? A. Between 3.075m and 3.125 m B. Between 3.080m and 3.120 m C. Between 3.085m and 3.115 m D. Between 3.090m and 3.110 m
Transcribed Image Text:13. The shelf life of a particular dairy products is normally distributed with a mean of 12 days and a standard deviation of 3 days. About what percent of the products will last between 12 and 15 days? . 2.5% В. 16% C. 34% D. 68% 14.The mean life of a tire is 30,000 km and the standard deviation is 2,000 km. What are the possible limits if 68% of all tires will be considered? A. 24,000 km and 34,000 km B. 26,000 km and 34,000 km C. 27,000 km and 31,000 km D. 28,000 km and 32,000 km 15.A company makes parts for a machine. The lengths of the parts must be within a certain limit or they will be rejected. A large number of parts were measured and the m an and the standard deviation were calculated as 3.1m and 0.005m, respectively. What are the limits if 99.7% of the parts were accepted? A. Between 3.075m and 3.125 m B. Between 3.080m and 3.120 m C. Between 3.085m and 3.115 m D. Between 3.090m and 3.110 m
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