Fifteen SmartCars were randomly selected and the highway mileage of each was noted The analysis yielded a mean of 47 miles per gallon and a sample standard deviation of 5 miles per gallon Which of the following would represent a 90% confidence interval for the average highway mileage of all SmartCars? A. 47 plusminus (1.753*(5 + 3.8730) B. 47 plusminus (1.345*(5 + 3.8730) C. 47 plusminus (1.765*(5 + 3.8730) D. 47 plusminus (1.645*(5 + 3.8730)

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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.

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step-by-step explanation:

the triangles are similar. therefore the corresponding sides are in proportion:

              cross multiply

            divide both sides by 32

the second option

step-by-step explanation: