9 + b = ? if b = 3 what is the answer
1 answer:
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Answer:
<em>m = - 2</em>
Step-by-step explanation:
( ,
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( ,
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m =
Answer:
Step-by-step explanation:
Given that the time to complete a standardized exam is approximately normal with a mean of 70 minutes and a standard deviation of 10 minutes.
P(completing exam before 1 hour)
= P(less than an hour) = P(X<60)
=P(Z<)
=0.5-0.34=0.16
i.e. 16% of students completed the standardized exam.