I MICHAEL HAD 80% MORE MONEY THAN ALVIN. VANESSA HAD

40% LESS THAN ALVIN, MICHAEL AND ALVIN GAVE VANESSA

SOME MONEY IN THE RATIO 3 : 2 RESPECTIVELY. IN THE END,

VANESSA HAD TWICE AS MUCH MONEY AS BEFORE. GIVEN THAT

MICHAEL HAD $144 MORE THAN VANESSA IN THE END. HOW

MUCH MONEY DID EACH OF THEM HAVE AT FIRST?

G

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?