Question points$)$

A chocolate factory has weighed $4$ chocolate truffles coming out of production over $5$ working

days to obtain the following data, weights are in grams.

a$)$ Group the data by day and find the sample average and range for each of the five

samples. $(4$ pts$)$

b$)$ Find the center lines for X$-$bar and R chart $(2$ pts$)$