I am lost, so I'd greatly appreciate as detailed an explanation as possible. Thank you!

4. Lithium-ion batteries are weighed for quality check, and the data from an 8-hour production period are Weight 30.6 to 30.8 to 31.0 to 31.2 to 31.4 to [gm] 3160 Number 22 480 5,106 10,461 4,618 619 15 Determine whether the weights are Gaussian-distributed. Is there reason to suspect quality control problem with batteries weighing less than 30.6 or more than 31.6 gm