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2. Use technology or a z-distribution table to find the indicated area. The scores for a bowling tournament are normally distributed with a mean of 240 and a standard deviation of 100. Julian scored 240 at the tournament. What percent of bowlers scored less than Julian?
A.10
B. 25
C.50
D.75

3. Use technology or a z-distribution table to find the indicated area. The odometer readings on a random sample of identical model sports cars are normally distributed with a mean of 120,000 miles and a standard deviation of 30,000 miles. Consider a group of 6000 sports cars. Approximately how many sports cars will have less than 150,000 miles on the odometer?
A.300
B.951
C.5048
D.5700

Respuesta :

HomertheGenius
2. Julian scored 240 and a mean is also 240. Therefore he scored better than 1/2 of bowlers.
Answer: C ) 50%
3. Mean = 120,000 miles
Standard deviation = 30,000 miles
150,000 miles = Mean + 1 standard deviation
From table for the Normal Distribution:
F ( z = 1 ) = 0.84134
6,000 * 0.84134 = 5,048.04 ≈ 5,048
Answer: C ) 5,048

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