2 years ago

If you choose one student at random, what is the probability (±0.0001) that the student's score is between 20 and 30?

1 answer:

5 0

Z-score for 30 = (30 - 25) / 5.8 = 0.8621
z-score for 20 = (20 - 25) / 5.8 = -0.8621
:
Note find probabilities from z-tables
:
Probability ( 20 < X < 30 ) = 0.8051 - 0.1949 = 0.6102

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