I am looking for a little guidance or help with the following question:
The standard deviation of the masses of 600 blocks is 248 kg.
A random sample of 55 blocks has a mean mass of 4.72 Mg.
With what degree of confidence can it be said that the mean mass of all the blocks is 4.72 ± 0.100 Mg?
I've tried reading up some information on the normal distribution table but can't really get my head around it. Could anyone offer me some advice or provide me with a good link with information on the subject?