The weights of the grade 5 students in a certain elementary schol are normally distributed with a mean of 82 pounds (Ibs.) and a standard deviation of 7 lbs. For items a to c, suppose a student is chosen at random.
a.) What is the probability that his/her weight is above 90 Ibs.?
b.) What is the probability that his/her weight is below 80 lbs.?
c.) What is the probability that his/her weight is between 75 and 85 lbs.?
d.) If there are 300 students in grade 5, how many students weig
below 80 lbs.?
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