True.
Since 615 ends in 5, it is divisible by 5.
Since the sum 12, of the digits of 615, is divisible evenly by 3, 615 is divisible by 3.
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615/5 = 123
No, any number which is perfectly divisible by 9 has its digits equal to a multiple of 9. The closest multiples of 9 to 615 are 612 and 621. (68 x 9 and 69 x 9 respectively).
615/5 = 123 5 goes into 615 123 times.
7.6875
615 is the mean.