The arithmetic mean of the numbers 30, x, 38, 84 and 96 is 58, what is the arithmetic mean of 96, 68, 84 130 and x?
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Mean =sum of observation/number of observation
58 = 30+x+38+84+96/5
58 =x+248/5
x+248=290
x=290-248
x=42
Mean=96+68+84+130+x/5
=96+68+84+130+42/5
=420/5
=84
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