Solution

 (a) In general, you should use between 5 and 12 class intervals.

(c) The number of measurements that are less than 5.1 can be obtained by adding all frequencies of the classes $1.6<-2.1$, $2.1-<2.6$, ...., $4.6-<5.1$.

$$$$2+5+5+5+14+6+6=43

Since we have data about 50 measurements, 43 out of the 50 measurements are less than 5.1.

(d) The number of measurements that are larger than 3.6 can be obtained by adding all frequencies of the classes $3.6<-4.1$, $4.1-<4.6$, ...., $6.1-<6.6$.

$$$$14+6+6+2+3+2=33

Since we have data about 50 measurements, 33 out of the 50 measurements are more than 3.6.

Answer

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