According to medical data, the ages at which patients have their first hip replacement surgery follows a normal distribution. The average age for a first hip replacement is 55 years
of age, with a standard deviation of 8 years. Therefore, doctors can expect 99.7% of their hip
replacement surgery patients to be between what ages?
O 47-63
O 39 - 71
O 31 - 79
O 45-65
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What is the exact volume of the cylinder (radius 13 in., height 30 in.)

Isuck at math ; ^; m a student solved this problem and said the answer is 3 feet. chase had a roll of ribbon that contained 7 7/8  feet of ribbon. he cut off one piece that was 3 5/8  feet long and another piece that was 1 1/4  feet from the roll. how much ribbon was left on the roll? is the student's answer reasonable? yes, the answer is reasonable. no, the answer is not reasonable. it should be about 2 feet. no, the answer is not reasonable. it should be about 13 feet. no, the answer is not reasonable. it should be about 4 feet.

If you have the following equation, 2/3x+5/6-x=2-3/4x what would you multiply each term by to get rid of all the fractions