A 95% confidence interval is (54.5, 57.5) based on a sample size of 25. What is the sample standard deviation?
Two hundred simulation runs were completed using the probability of a machine breakdown from the table below. The average number of breakdowns from the simulation trials was 1.93 with a standard deviation of 0.20.
No. of breakdowns per week Probability Cumulative probability
0 .10 .10
1 .25 .35
2 .36 .71
3 .22 .93
4 .07 1.00
A) 3.826
B) 19.132
C) 8.973
D) 11.646
Answer: A
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