6. (6 pts) The batteries used by a calculator have useful lives that follow a normal distribution, with a mean of 1000 hours and a standard deviation of 200 hours. (a) Find the range of middle 95% batteries useful life. (b) A random sample of 100 batteries is drawn. Find the range of middle 95% sample means of batteries useful life.

hi,

6x times 4 is 24x and 5 times 4 is 20, so the answer is 24x+20.

hope this and for a little humor i am groot.

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6

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