5. If the mean of the data 3, 21, 25, 17, (x + 3), 19,(x - 4) is 18, find the value
of x. Using this value of x, find the mode of the data.
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Answer:
18=(3+21+25+17+x+3+19+x-4)/7
18×7=84+2x
126-84=2x
42=2x
x=21
the data is :
3,21,25,17,24,19,17
so the mode of data is 17.
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