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Step-by-step explanation:
mean = sum of values/ no. of values
=sum of value×its frequency/sum of no. of frequency
mean of height of children
=60×2+61×3+62×5+63×8+64×7/(2+3+5+8+7)
=62.6
mean of Marks of children
=6×15+ 20×7 + 25×12 +30×14+35×15+40×6/(6+7+12+15+14+6)
let mean =25
=(-10×6)+-5×7+0×12+5×14+10×15+15×6/60
=-60-35+70+150+90/60=3.583
=28.583
mean= 18+40+105+9p+88+52/41+p =8
= 303+9p=328+8p
p=25
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