can anyone help with this problem please:

the problem involves oranges n the masses in grams

the mass X grams of a particular variety of orange is normally distributed with mean 205g and standard deviation 25g

if the smallest 30% of oranges are graded 'small', how do you determine the maximum weight of an orange graded 'small'?

thanks, n apologies as that is all the information i have. i mainly looking for help how to determine it rather than the answer please.