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The arithmetic mean of the following …

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The arithmetic mean of the following distribution is 50. Find the missing frequency p. C.I. 0-20 20-40 40-60 60-80 80-100 Frequency 7 6 9 13 p

Posted by Aradhna Sharma 6 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Fatma Naayab 6 years, 9 months ago

xi = 10, 30,50,70,90 di= -40,-20,0,20,40 mark 50 for assume in xi multiply fi×di fidi= -280,-120,0,260,40p total fidi = -400-260+40p= -130+40p now calculate total fi = 7+6+9+13+p =35+ p mean = A+ fidi/fi 50=50+ (-130)+40p/35+p 50-50=(-130)+40p/35+p 0=(-130)+40p/35+p 0×35+p= (-130)+40p now calculate n get ans

0Thank You

Fatma Naayab 6 years, 9 months ago

1st calculate xi then di

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CBSE > Class 10 > Mathematics