Standard deviation and mean question
A citrus farmer has determined that the diameters of its grapefruits are normally distributed with a mean of 4.5 inches and a standard deviation of 0.3 inches.
Is the answer of 4.2 correct?
c. The farmer packs its largest grapefruits in special packages called the super pack. If 5 percent of all their grapefruits are packed as super packs, what is the smallest diameter of the grapefruits that are included\
I can't seem to find the formula for this problem.
d. In this year’s harvest, there were 111,500 grapefruits that had a diameter over 5.01 inches. How many grapefruits has the grower harvested this year __________
Please let me know if you can please help.