please help me on this question with a step by step solution. thanks.

1.A fruit stall sells tomatoes ,apricots and plums a. The weights of tomatoes are normally distributed with a mean of 200 grams and standard deviation of 25 grams i. Given that there 450 tomatoes are in the stall what is the expected number of tomatoes with weights more than 225 grams ii. Given 70% of the tomatoes are less than m grams, find the value of m. [8] b. The weights of apricots are normally distributed with a mean u grams and standard deviation of o grams. Given that 8% of the apricots have a weight of more than 270 grams and 15% of the apricots have a weight less than 250 grams. Find the value of u and o. [7]