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Please show calculations for this question: The mean amount spent by a family of four on...

Please show calculations for this question:

The mean amount spent by a family of four on food per month is $500 with a standard deviation of $75. Assuming that the food costs are normally distributed

What is the probability that a family spends less than $410 per month? [z=-1.20; 0.1151]
From a sample of 25 families, what is the probability of having a sample mean exceeding $515?   [z=1; 0.1587]          

math   Statistics-And-Probability   
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