The average life of a bread-making machine is 7 years, with a standard deviation of 1 year.
Question:
(a) The probability that the mean life of a random sample of 9 such machines falls between 6.4 and 7.2 years;
(b) The value of a; to the right of which 15% of the means computed from random samples of size 9 would fall.
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Related Book For 
Probability & Statistics For Engineers & Scientists
ISBN: 9780130415295
7th Edition
Authors: Ronald E. Walpole, Raymond H. Myers, Sharon L. Myers, Keying
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