The following box-plot contains the cholesterol levels of 100 patients. How many of the patients had cholesterol levels between 154 and 211?

The following box-plot contains the cholesterol levels of 100 patients. 

How many of the patients had cholesterol levels between 154 and 211?

Question 6 options:

75

31

50

57

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