What is the probability that a person who is above 35 years old has a hemoglobin level of 9 or above?

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Step-by-step explanation:

Let X is the number of person who is older than 35 years has a hemoglobin level between 9 and 11

We know the total number of people above 35 is 162

=> 76+x+40=162

<=> x=46

The number of person who is older than 35 years has a hemoglobin level between 9 and 11 is 46.

A. The probability that a person who is older than 35 years has a hemoglobin level between 9 and 11 is:

P = ≈ 0.284

B. .Person who is older than 35 years has a hemoglobin level  of 9 and above is :

P = ≈ 0.531