Statistics: Find these statistics

1)Sarah has an average of 92.5 for her 3 sciences tests. What does she need to make on her 4th test to get a 94% average?

This is easy....she needs  94 (4)  =   376 total points

So far....she has  92.5 (3)  =  277.5 points

So...she needs   376 - 277.5  = 98.5 points on the 4th test

2) The Pep Club is selling flower arrangements with a choice of 4 different kinds of flower, 3 kinds of greenery, and with or without babies breath. How many different flower arrangements do they offer?

I'm taking a guess as to what is meant here, Manuel...but...I believe the answer is  4 * 3 * 2  = 24 diferent arrangements

3)The athletic director has 6 trophies won by school teams this year, but only enough space in the trophy case to display 3 at a time. How many different ways can he display the trophies if order is important?

If order is important we have an arrangement in each possible set....this indicates a permutation...so we want to choose any 3 of the 6 trophies ans pay attention to their arrangement...so the answer  is:

P(6,3)   =  120  ways

thanks, Cphill!!