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  1. 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

B25

C.50

D.75

  1. 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

Verified Answer :

HomertheGenius
  1. 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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