Answer
The probability that a randomly selected sixth-grade student reads more than 140 words per minute is 0.26.
Work Step by Step
$\mu$ = 125, $\sigma$ = 24
Want to find $P(x > 140)$
i) Convert 140 to a z-score
z = $\frac{x - \mu}{\sigma}$
z = $\frac{140 - 125}{24}$
z $\approx$ 0.63
ii) $P(x > 140) = P(z > 0.63)$
$P(z > 0.63)$
= $1 - P(z < 0.63)$
=$ 1 - 0.7357$
= $0.26$
Therefore, P( x > 140) = 0.26
