The problem asked if the cholesterol levels of 100 patients. How many of the patients had cholesterol levels between 154 and 211?

The problem asked if the cholesterol levels of 100 patients. How many of the patients had cholesterol levels between 154 and 211? the mean is 197.5.

75

31

50

57

May you please explain it how to do it and give me the correct answers please. Thanks You