Megan writes down a list of five numbers. The mean of her first three numbers is −3. The mean of her first four numbers is 4. The mean of her first five numbers is −5.
What is the difference between her fourth number and her fifth number?
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Answer:
66
Step-by-step explanation:
(a+b+c)/3 = -3 , a+b+c = -9
(a+b+c+d)/4 = 4, a+b+c+d = 16. The 4th no. d = 16+9=25
(a+b+c+d+e)/5 = -5 ,
a+b+c+d+e = - 25, Thus 5th no. e = - 41
Thus difference between 4th and 5th no. is
d-e = 25- (- 41) = 66
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