If the mean and variance of the data | Class | – | – | – | – | |---|---|---|---|---|…

MATHEMATICS · Numerical · CBSE · Mathematics · Statistics · Statistics

Problem

If the mean and variance of the data

Class	$4$ – $8$	$8$ – $12$	$12$ – $16$	$16$ – $20$
Frequency	$3$	$\lambda$	$4$	$7$

are

\mu

and

19

, respectively, then the value of

\lambda+\mu