7 + 4 + 9 + 8 + 2 = 30
So mean = 30/5 = 6
72 + 42 + 92 + 82 + 22 = 214
So variance = 214/5 - 62 = 42.8 - 36 = 6.8
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2 8/7 divided by 4/7 is the same as 8/7 times 7/4... The 7s then cancel out and you get 8/4 which is 2
4/7 * 2/3 = 8/21.4/7 * 2/3 = 8/21.4/7 * 2/3 = 8/21.4/7 * 2/3 = 8/21.
4/7 * 7/8 = 4/8 = 1/2.
((7-2) * 4) + 8 = (5 * 4) + 8 = 20 + 8 = 28
2/4 is smaller than 4/7 1/2=2/4 1/2=7/14 4/7=8/14 7/14 is less than 8/14