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6. When a standardized test was scored, there was a mean of 500 and a standard...

6. When a standardized test was scored, there was a mean of 500 and a standard deviation of 100. Suppose that 10,000 students took the test and their scores had a bell-shaped distribution, making it possible to use a normal curve to approximate the distribution.

1).____________________ How many scored between 400 and 600?

2).____________________ How many scored between 300 and 700?

3)____________________ How many scored above 800?

Math   Statistics-And-Probability   
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