Trypanosomes are parasites that cause disease in humans and animals. In an early study of trypanosome morphology, researchers measured the lengths of 500 individual trypanosomes taken from the blood of a rat. The results are summarized in the accompanying frequency distribution.

(a) Construct a histogram of the data using 24 classes (i.e., one class for each integer length, from 15 to 38).
(b) What feature of the histogram suggests the interpretation that the 500 individuals are a mixture of two distinct types?
(c) Construct a histogram of the data using only 6 classes. Discuss how this histogram gives a qualitatively different impression than the histogram from part (a).

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Length (um) Frequency (number of individuals) Frequency (number of individuals) Length (μm) 27 28 29 30 31 32 41 48 28 43 27 17 18 19 20 21 21 27 15 10 24 25 26 19 21 34 34 35 36 37 38