Answer
a)$-\$ 1,449,778.$
b)2.75
c)-2.75
d)Not usual.
Work Step by Step
a) Difference between Jobs' salary and the mean of the CEO salaries: $\$1-\$ 1,449,779=-\$ 1,449,778.$
b)$z=\frac{x-\mu}{\sigma}=\frac{\$1-\$ 1,449,779}{\$527,651}=-2.75.$
Hence Jobs' salary is 2.75 standard deviations from the mean of the CEO's salary.
c)$z=\frac{x-\mu}{\sigma}=\frac{\$1-\$ 1,449,779}{\$527,651}=-2.75.$
d) The z-score of Jobs' salary is less than 2, hence it is not usual.
