Heights of ten year old boys (5th graders) follow an approximate normal distribution with mean =55.5 inches and standard deviation =2.7 inches. 11 Centers for Disease Control and Prevention growth chart at http://www.cdc.gov/growthcharts/html_charts/statage.htm. (a) According to this normal distribution, what proportion of 10 -year-old boys are between 4ft3.5 in and 5ft0.5in tall (between 51.5 inches and 60.5 inches)? Round your answer to three decimal places. Proportion = eTextbook and Media (b) A parent says his 10-year-old son is in the 99th percentile in height. How tall is this boy? Round your answer to two decimal places. Height = inches.