Question 1147103
Use the Normal Distribution and table of z-values
:
standard deviation = square root(25) = 5
:
standard error = 5/square root(35) = 0.8452
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z = (28 - 30)/0.8452 is approximately -2.37
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The probability(P) associated with the z value is 0.0089
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P(X > or = 28) = 1 - 0.0089 =  is approximately 0.9911
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