if the mean of five observations x, x+1, x+2, x+3 and x+4 is 19. Find the mean of first three observations.
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The value of x will be 17
The mean of first three observations,
will be 18
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if the mean of five observations x, x+1, x+2, x+3 and x+4 is 19. Find the mean of first three observations
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