A recent survey found that 25.9% of all adults over 70 wear glasses for driving. In a random sample of 81 adults over 70, what is the standard deviation of the number who wear glasses?

3.41

Step-by-step explanation:

Given : In a recent survey found that 25.9% of all adults over 70 wear glasses for driving.

i..e Proportion of adults over 70 wear glasses for driving : p= 25.9%=0.259

Sample size : n= 81

Now , the formula to find the standard deviation :

Then , the standard deviation of the number who wear glasses would be :

Hence, the standard deviation of the number who wear glasses = 3.41 .

since proposition states that a number is greater than 25, if is true then the number must actually be greater than 25.

this implies that all possible options, except 24, can be accepted