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salantis [7]
4 years ago
7

The mean per capita consumption of milk per year is 131 liters with a variance of 841. If a sample of 132 people is randomly sel

ected, what is the probability that the sample mean would be less than 133.5 liters? Round your answer to four decimal places.
SAT
1 answer:
dimaraw [331]4 years ago
7 0
The probability that the the sample mean would be less than x=132.25 will be calculated as follows:
z=(x-σ)/μ
μ- mean
σ- standard deviation
z=(132.25-138)/28=-0.2054
thus:
P(X≤x)=0.4207=42.07%
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