Hi guys, this is the question
UPVC facia board is supplied in lengths labelled as 5 metres. The actual length, X metres, of a board may be modelled by a normal distribution with a mean of 5.08 and a standard deviation of 0.05
i) Determine the probability that the mean length of a random sample of 4 boards:
a) exceeds 5.05 metres
b) is exactly 5 metres.
Thankyou! any help will be massively appreciated!