Two different types of alloy, A and B, have been used to manufacture experimental specimens of a small tension link to be used in a certain engineering application. The ultimate strength (ksi) of each specimen was determined, and the results are summarized in the accompanying frequency distribution.

A B 26 –  30 6 4 30 –  34 12 9 34 –  38 15 19 38 –  42 7 10 m
40 n
42