Exercise $6-24$ Algo

The random variable $x$ is normally distributed. Also, it is known that $P(x>146)=0\mathrm{.}09.[$You may find it useful to reference the $z_{?}$ table.$]$

a$.$ Find the population mean $$ if the population standard deviation $=16.($Round $"z"$ value to $3$ decimal places and final answer to $2$ decimal places.$)$

Mean

b$.$ Find the population mean $$ if the population standard deviation $=26.($Round $"z"$ value to $3$ decimal places and final answer to $2$ decimal places.$)$

Mean