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 amean of 12 days and a standard deviation of 3 days. About what percent ofthe 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 kmB. 26,000 km and 34,000 kmC. 27,000 km and 31,000 kmD. 28,000 km and 32,000 km15.A company makes parts for a machine. The lengths of the parts must bewithin a certain limit or they will be rejected. A large number of parts weremeasured and the man and the standard deviation were calculated as 3.1mand 0.005m, respectively. What are the limits if 99.7% of the parts wereaccepted?A. Between 3.075m and 3.125 mB. Between 3.080m and 3.120 mC. Between 3.085m and 3.115 mD. Between 3.090m and 3.110 m

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A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

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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

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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%