Forty children, under the age of 5 years, were diagnosed with acute lymphoblastic leukemia (ALL) during the past year. The age of each child was recorded (in months) at the time of diagnosis. Listed are the ages from youngest to oldest: 13, 15, 16, 18, 18, 20, 21, 23, 24, 24, 25, 25, 27, 28, 30, 32, 32, 32, 34, 36, 37, 38, 40, 40, 41, 42, 44, 45, 45, 47, 48, 48, 49, 50, 52, 53, 55, 57, 58, 58.

Calculate: a. Range.

b. Mode.

c. Median.

d. Mean from an ungrouped distribution.

e. Mean from a grouped distribution, correct to the nearest whole number, with the lowest interval, 11-15.

f. Variance from a grouped distribution, with the lowest interval, 11-15, using the grouped mean correct to the nearest whole number.

g. Standard deviation from a grouped distribution, with the lowest interval, 11-15.