Answer to Question #139870 in Statistics and Probability for Stellar Jennie

Question #139870
The population mean weight of a candy is 10 grams with a standard deviation of 2 grams. A sample of 100 candies is taken. What is the probability that the sample mean is 9.7 grams or lower?
1
Expert's answer
2020-10-25T18:38:35-0400

Given : μ=10σ=2\mu=10\\ \sigma=2

n=100


Formula: Z=xμσnZ= \frac{\overline x-\mu}{\frac{\sigma}{\sqrt{n}}}

Solution:

substitute the values to find z

Z=9.7102100Z= \frac{9.7-10}{\frac{2}{\sqrt{100}}} −1.5


Using z table,Pr(x9.7)=Pr(Z1.5)=0.0668Pr( \overline x≤9.7)=Pr(Z≤−1.5)=0.0668



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