The probability that an individual has 20-20 vision is 0.19. in a class of 40 students, what is the mean and standard deviation of the number with 20-20 vision in the class? round to the nearest thousandth.

7.6, 2.4211

Step-by-step explanation:

Given that the probability that an individual has 20-20 vision is 0.19.

No of class students =n=40

p = 0.19 and q = 1-0.19 = 0.81

Since each student is independent of the other and there are two outcomes either 20-20 vision or no, we find that X the no of students having 20-20 vision is binomial with n =40 and p = 0.19

Mean

Variance of X = npq =

Std deviation = square root of variance =2.4811

sorry i need the points

step-by-step explanation:

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1010: 3030

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