A shopkeeper records the age (in years) of 60 customers buying a phone: 15-25: 8, 25-35: 18, 35-45: 20, 45-55: 10, 55-65: 4. Using the assumed mean method with a = 40, find the mean age.

Question

Accepted Answer

37.33. Class marks: 20,30,40,50,60. di = -20,-10,0,10,20. fi*di = 8*-20+18*-10+20*0+10*10+4*20 = -160-180+0+100+80 = -160. sum fi = 60. Mean = 40 + -160/60 = 40 - 2.67 = 37.33.

A shopkeeper records the age (in years) of 60 customers buying a phone:
15-25: 8, 25-35: 18, 35-45: 20, 45-55: 10, 55-65: 4.
Using the assumed mean method with a = 40, find the mean age.

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More Class 10 Mean of Grouped Data practice

A shopkeeper records the age (in years) of 60 customers buying a phone:15-25: 8, 25-35: 18, 35-45: 20, 45-55: 10, 55-65: 4.Using the assumed mean method with a = 40, find the mean age.

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 10 Mean of Grouped Data practice

A shopkeeper records the age (in years) of 60 customers buying a phone:
15-25: 8, 25-35: 18, 35-45: 20, 45-55: 10, 55-65: 4.
Using the assumed mean method with a = 40, find the mean age.