Question 623218
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Hi,
Students who have completed a speed reading course have reading speeds 
that are normally distributed with a mean of 950 words per minute and a standard deviation equal to 220 words per minute. 
P( x < 400) = P(z < -550/220) = p( z < -2.5) = .006  | Using Excel function NORMSDIST(-2.5)
If two students were selected at random, 
P(both read < 400 words per minute) = {{{.006*.006}}}