Question

The mid value of a class interval is $42$ and the class size is $10.$ What are the lower and upper limits $?$

• A. Lower lim$=37$ and upper lim$=47$
• B. Lower lim$=37$ and upper lim$=57$
• C. Lower lim$=77$ and upper lim$=47$
• D. None of these

Answer 1

The correct option is A Lower lim$=37$ and upper lim$=47$

Midvalue of class interval is $42$.

then lower limit $=x$

upper limit $=y$

$x+y=43x+y=84$ .....(i)

and $y-x=10$ .....(ii)

$x=$ lower limit $=37$.

$y=$ upper limit $=47$.