Question

1. p(-2.8 < z < -1.17)

Explanation:

Step1: Use standard - normal table property

$P(-2.8 < z < -1.17)=P(z < - 1.17)-P(z < - 2.8)$

Step2: Look up values in standard - normal table

From the standard - normal table, $P(z < -1.17)=0.1210$ and $P(z < -2.8)=0.0026$

Step3: Calculate the probability

$P(-2.8 < z < -1.17)=0.1210 - 0.0026$
$P(-2.8 < z < -1.17)=0.1184$

Answer:

$0.1184$