The sample will have 42 × 10^5 red blood cells.
Here, we are given that an average person has 6 x 10^2 times as many red blood cells as white blood cells.
This means that if a person has 1 white blood cell, he/she will have 6 x 10^2 red blood cells.
Now, it is given that a sample of blood collected has 7 x 10 ^3 white blood cells.
Thus, the number of red blood cells present in the sample will be-
(7 x 10 ^3) (6 x 10^2)
= 7 x 6 × 10^3 x 10^2
= 42 × 10^5
Thus, the sample will have 42 × 10^5 red blood cells.
Learn more about averages here-
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