Question

find the deviation about mean the following data
Xi 5,10,15,20,25
fi 7,4,6,3,5​

Answer 1

Step-by-step explanation:

given,

xi=5,10,15,20,25

fi=7,4,6,3,5

di=xi-a

let 'a' be the first term of xi = 5

di=5-5,10-5,15-5,20-5,25-5

= 0,5,10,15,20

ui=di/h

h=5

ui = 0,1,2,3,4

sum of fi×ui = 0+4+12+9+20

= 45

sum of fi= 7+4+6+3+5

= 25

mean = a + sum of fi×ui / sum of fi × h

= 5+ 45/25 × 5

= 5+9/5×5

= 5×9

= 45

therefore, mean by step deviation method = 45

it helps you...