Write a number between 40 and 60. The number is divisible by 6 and has exactly 10 factors.
2 answers:
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Answer: C. 12.5
Step-by-step explanation:
Given : A manufacturer of new light bulbs claims the average lifetime of its long-life bulb is more than 4000 hours.
Population mean :
Sample size : n= 100
Sample mean :
Standard deviation:
The value of test-statistic is given by :-
Hence, the value of the test statistic for this problem is 12.5.