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# Finding Probability and Confidence Intervals

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Of the members of a Boy Scout troop, 15% have received the first aid merit badge. If 40 boy scouts are selected at random, find the probability that four or more will have the first aid merit badge?
A) 86.6%
B) 81.3%
C) 36.6%
D) 31.3%

A food snack manufacturer samples 9 bags of pretzels off the assembly line and weighs their contents. If the sample mean is 12.7 oz. and the sample standard deviation is 0.70 oz., find the 95% confidence interval of the true mean.
A)

B)

C)

D)

https://brainmass.com/statistics/probability/finding-probability-confidence-intervals-447951

#### Solution Preview

Probability
Of the members of a Boy Scout troop, 15% have received the first aid merit badge. If 40 boy scouts are selected at random, find the probability that four or more will have the first aid merit badge?

The probability can be computed using the binomial random variable.
P(X=x)= . The probability for different values of X are given ...

#### Solution Summary

The following posting helps calculate confidence intervals. Sample standard deviation for true means are given.

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