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1. We would like to estimate the mean amount of money spent on books by students...

1. We would like to estimate the mean amount of money spent on books by students in a year. Assuming the amount spent on books by students is normally distributed, we have the following data from 40 randomly selected students: N ($249, $30). Using a 95% confidence interval, the true mean of money spent on books by students in a year is between what two amounts?

2. Suppose we know that the birth weight of babies is Normally distributed with mean 3500g and standard deviation 500g. What is the probability that a baby is born that weighs less than 3100g?

Math   Statistics-And-Probability   
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Note-if there is any understanding problem regarding this please feel free to ask via comment box..thank you

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