Determine the percent of batteries with a lifetime between 38.4 hours and 44.4 hours, given that the battery’s mean lifetime is 42 hours with a standard deviation of 1.2 hours. Please show steps.

step-by-step explanation:

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^

step-by-step explanation:

there are 36 inches in a yard

25 : 36 = 0.69 yards (you can round to 0.70)

144.50

step-by-step explanation:

21.5 x 13.4=288.10 divide by 2