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The mean endurance time for a sample of 36 girls 4-5 years old was 9.5 minutes...

The mean endurance time for a sample of 36 girls 4-5 years old was 9.5 minutes with a standard deviation of 1.86 minutes. If we assume that these are the true population mean and standard deviation, and if we also assume that the endurance time follows a normal distribution, what is the probability of observing 4 year old girl with an endurance of 7 minutes? Is the data set normally distributed? Explain your answer.

Math   Statistics-And-Probability   
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hii... although I am trying to provide the detailed answer but if you have any doubt please ask by comment. your rating encourage us to provide the detailed and effective answers so please like the answer. thanks

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