SOLUTION: The ages of all kindergarten children are normally distributed with mean 4 years and standard deviation 6 months. What is the probability that a randomly chosen kindergarten c

Question 824127: The ages of all kindergarten children are normally distributed with
mean 4 years and standard deviation 6 months.
What is the probability that a randomly chosen kindergarten child
will be older than 5 years, 4 months old?
Use Table A-2 and write your answer as a decimal with 4 decimal places.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The ages of all kindergarten children are normally distributed with
mean 4 years and standard deviation 6 months.
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What is the probability that a randomly chosen kindergarten child
will be older than 5 years, 4 months old?
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Note: 5 yrs 4 months = 5 1/3 = 16/3 yrs
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z(16/3) = [(16/3)-(12/3))/(18/3) = (4/3)/(18/3) = 2/9
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P(x > 5yrs 4 mths) = P(z > 2/9) = normalcdf[(2/9),100] = 0.4121
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Cheers,
Stan H.
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