Peter would like to select a sample from a large Which sample size would give Peter the least amount population that is normally distributed with a mean of 50 of variability in the sampling distribution of the sample
and a standard deviation of 22.

Which sample size would give Peter the least amount of variability in the sampling distribution of the sample mean?

A. 5
B.10
C.30
D. 50

idk

step-by-step explanation:

i don't know

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15