4.21. The average height of professional basketball players is around 6 feet 7 inches, and the standard deviation is 3.89 inches. Assuming Normal distribution of heights within this group, (a) What percent of professional basketball players are taller than 7 feet? (b) If your favorite player is within the tallest 20% of all players, what can his height be?

4.21. The average height of professional basketball players is around 6 feet 7 inches, and the
standard deviation is 3.89 inches. Assuming Normal distribution of heights within this
group,
(a) What percent of professional basketball players are taller than 7 feet?
(b) If your favorite player is within the tallest 20% of all players, what can his height be?