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The grades obtained by students in a statistic course are distributed according to a random variable...

The grades obtained by students in a statistic course are distributed according to a random variable X of normal distribution:

X - N(68,100^2)

a-We choose a candidate randomly . What is the probability that he has a score between 60 and 70?

b-The professor wants to give an A rating to 5% of students with the highest marks? Determine the minimum grade necessary to obtain A.

Math   Statistics-And-Probability   
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