From a recent production run of compact fl uorescent (cf) bulbs, you select a random sample of 10 bulbs. using an accelerated bulb life simulation, you fi nd that the average life for the bulbs in the sample is 2440 hours, with a sample standard deviation of 60 hours. use these sample results to test, at the 5% signifi cance level, the null hypothesis that the average life for the full population—the entire production run—of bulbs is pre-cisely 2500 hours, no more and no less. report your con-clusion and explain. "

Plz hurry evaluate the expression a+b where a=8 and b=19

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

Match the scale and the actual area to the area of the corresponding scale drawing. scale: 1 inch to 4 feet actual area: 128 square feet scale: 1 inch to 7 feet actual area: 147 square feet scale: 1 inch to 8 feet actual area: 256 square feet scale: 1 inch to 5 feet actual area: 225 square feet area of scale drawing scale and actual area scale drawing area: 3 square inches arrowright scale drawing area: 8 square inches arrowright scale drawing area: 4 square inches arrowright scale drawing area: 9 square inches arrowright