Solution

 

(b) We note that there are 23 leaf's with stem 0, which implies that 23 of the 60 services times are less than 1 minute.

However, we also note that there are 2 leaf's 0 at the stem 1, which implies that 2 of the 60 services times are 1 minute.

$$$$\frac{23+2}{60}=\frac{25}{60}

Thus the fraction of service times less than or equal to 1 minute is 25/60.

(c) The smallest data value is given at the top of the stem plot.

Thus the smallest measurement is given by $0|2$ in the stem-plot, which represents the data value 0.2 and thus the smallest measurement is 0.2.

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