The mean of 7 numbers is 63 if the 6 number are 65 ,7068,59,73,55 find the 7th number
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Mean = sum of numbers/no.of numbers
63 = (65+70+68+59+73+55+x)/7
63*7 = 390+x
441-390 = x
x = 51.
Therefore,the 7th number is 51.
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