The hand spans of ninth-grade students at Martin Luther King, Jr. High are approximately normally distributed,
with a mean of 7 inches and a standard deviation of 1 inch. Of the following groups of measurements of hand span, which is expected to contain the largest number of ninth-graders?
a.between 6 and 8 inches
b.greater than 7 inches
c.less than 6 inches
d.between 5 and 7 inches