Question 1119698: A golfer is shopping for a golf ball. He wants to make sure that the brand has a desirable spin rate. He estimates ideal ball has a spin rate of about 7000 revolutions per minute for a five-iron shot. To test, the golfer hits the ball on 76 five-iron shots, and a computer measures the spin rate for each shot. The computer then produces
5000 to 5500 = 5
5500 to 6000 = 10
6000 to 6500 = 14
6500 to 7000 = 22
7000 to 7500 = 19
7500 to 8000 = 6
estimate the mean spin rate (in revolutions per minute) for the sample of five-iron shots.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A golfer is shopping for a golf ball. He wants to make sure that the brand has a desirable spin rate. He estimates ideal ball has a spin rate of about 7000 revolutions per minute for a five-iron shot. To test, the golfer hits the ball on 76 five-iron shots, and a computer measures the spin rate for each shot. The computer then produces
5000 to 5500 = 5
5500 to 6000 = 10
6000 to 6500 = 14
6500 to 7000 = 22
7000 to 7500 = 19
7500 to 8000 = 6
estimate the mean spin rate (in revolutions per minute) for the sample of five-iron shots.
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Procedure::
1. Find the midpoint value of each class.
2. Multiply each midpoint value by the listed frequency for its class
3. Add those products
4. Divide the sum of those products by the sum of the frequencies.
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Examples::
mean times freq:: (5000+5500)/2 * 5 = 5250*5 = 26250
mean times freq:: (5500+6000)/2 * 10 = 5750*10 = 57500
etc
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Cheers,
Stan H.
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