Question

find mean this equation ​

Answer 1

Answer:

ci 100-120|120-140|140-160|160-180|

180-200

fi | 12 14 8 6 10

xi | 110 130 150 170 190

di | -40 -20 0 20 40

fidi| -480 -280 0 120 400

here,

a=150, Σfi =50 & Σfidi = -240

now,

mean= a+Σfidi /Σfi

=150+(-240) / 50

=150-24/5

=(750-24) /5

=726/5

=125.2