Hey Alexander. Have you learnt about confidence intervals for the mean?
The standard deviation of the masses of fish in a large population is 4.55kg. If random samples of size 50 are drawn from this population, find the probability that the sample mean differs from the population mean by less than 0.8kg.
I don't understand what the question wants, please help. Thank you.
You're close. Remember that the question asks the probability that the sample mean differs by less than .8 kg - this means you want the confidence level, not the left tailed p value (which is what you calculated, .8925). Take the answer you got and remove the left tail and you'll have the correct answer.