I think it is c 0.819 ,0.8199 ,81/100 ,815/100
Answer:(3x+4)/x^2
Step-by-step explanation:
3/x+4/x^2
(3x +4) ➗ x^2=(3x+4)/x^2
Because n > 30, the sampling distribution of the mean ages can be approximated by a normal distribution with mean µ and standard deviation σ ÷ √(45) .The central limit theory applies whenever n > 30. Because n > 30, the sampling distribution of the mean ages can be approximated by a normal distribution with mean µ and standard deviation σ ÷ √(n) .
Answer:
.88
Step-by-step explanation:
The standard deviation is the square root of the variance.
