Question

pls help me to find out the answer pls

Answer 1

Answer:

Toltal no. Of frequency=6+7+9+12+x=34+x

Here total no. Of xi= 120+30x+300+490+810=1720+x

Mean= xi/fi

=44= 1720+x/34+x

= 1496+44x= 1720+ x

= 224= 43x

=51.2

Hope this help you