Which test do you use to decide whether an observed distribution is the same as an expected distribution?

Do private practice doctors and hospital doctors have the same distribution of working hours? Suppose that a sample of 100 private practice doctors and 150 hospital doctors are selected at random and asked about the number of hours a week they work. The results are shown in Table 11.27.

20-30 30-40 40-50 50-60 Private Practice 16 40 38 6 Hospital 8 44 59 39 Table 11.27