The SAT scores for students are normally distributed with a mean of 1100 and a standard...
Homework Answers
Answer:
Given,
P(1050 < X < 1120) = P((1050 - 1100)/(210/sqrt(90)) < (x-u)/(s/sqrt(n)) < (1120 - 1100)/(210/sqrt(90)))
= P(-2.26 < z < 0.90)
= P(z < 0.90) - P(z < - 2.26)
= 0.8159398 - 0.0119106 [since from z table]
= 0.804
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