SOLUTION: how do i find statistics on the following: Please show me your step by step work. thanks Tom has a average of 92.5 for his 3 history tests. what does he need to make on the 4th

Question 45466: how do i find statistics on the following: Please show me your step by step work. thanks
Tom has a average of 92.5 for his 3 history tests. what does he need to make on the 4th test to get at average of 94%?
The Girl Scouts are selling flower arrangements with a choice of 4 different kinds of flowers, 3 kinds are greenery, and with or without baby's breath. How many different flower arrangements do they offer?
The Bible Quiz team master has 6 trophies won by quiz teams this year, but only enough space on the book shelf to display 3 at a time. How many different ways can he display the trophies if order is important?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Tom has a average of 92.5 for his 3 history tests. what does he need to make on the 4th test to get at average of 94%?
Let his score on the 4th test be "x".
If the average on the 1st 3 tests is 92.5 they add up to 3(92.5)=277.5
Then the average of 4 tests is (277.5 + x) /4 = 4(94)
277.5+x = 376
x=98.5 (Score Tome will need on the 4th test)
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The Girl Scouts are selling flower arrangements with a choice of 4 different kinds of flowers, 3 kinds are greenery, and with or without baby's breath. How many different flower arrangements do they offer?
4*3*2=24 different flower arrangements.
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The Bible Quiz team master has 6 trophies won by quiz teams this year, but only enough space on the book shelf to display 3 at a time. How many different ways can he display the trophies if order is important?
6*5*4= 120 different arrangements
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Cheers,
Stan H.

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