A process that is considered to be in control measures

an ingredient in ounces. Below are the last $10$ samples $($each of size

n $=5)$ taken. The population process standard deviation, s$,$ is $1\mathrm{.}36.$

SAMPLES

$12345678910$

$109131012101013810$

$9991010101110812$

$1011101198108129$

$91110101112810128$

$121091010998912$

a$)$ What is sx $?$

b$)$ If z $=3,$ what are the control limits for the mean chart?

c$)$ What are the control limits for the range chart?

d$)$ Is the process in control?