## Introductory Statistics 9th Edition

a. From the given normal distribution, μ=15 and σ= 2.4. $P(x \gt 20)$ = $P(z \gt \frac{20-15}{2.4} )$ = $P( z \gt 2.0833)$ =0.0186 b. $P(x \gt 25)$ = $P(z \gt \frac{25-15}{2.4} )$ =$P( z \gt 4.167)$ =0 It's not possible since the probability of $P(x \gt 25)$ is 0.