91Ó°ÊÓ

³Ý´Ê±·(–$4,1$)

What is the median?

Use the following information to answer the next four exercises:

$X~N(54,8)$

Find the probability that$x>56.$

Use the following information to answer the next four exercises: $X~N(54,8)$

Find the probability that$x<30$

Find the 80th percentile.

Find the $60th$percentile.

$X~N(6,2)$

Find the probability that $x$is between three and nine.

$X~N(–3,4)$

Find the probability that x is between one and four.

$X~N(4,5)$

Find the maximum of $x$in the bottom quartile.

Find the probability that a CD player will last between $2.8$and six years.

$a.$Sketch the situation. Label and scale the axes. Shade the region corresponding to the probability.

$$\begin{gathered} X~N(3,5) \\ \mathrm{σ}=\_\_\_\_\_\_\_\_\_\_\_\_ \end{gathered}$$