Question

The mean weight of 4 parcels is 8.5kg. Three of them weighed 7.7 kg, 7.6 kg and 8.2 kg.

What is the weight of the fourth parce1?

Answer 1

• Weight of the fourth parcel will be 10.5 kg

Explanation:

• Weight of first parcal = 7.7 kg
• Weight of second parcel = 7.6 kg
• Weight of third parcel = 8.2 kg
• Mean Weight = 8.5 kg

Let weight of fourth parcel be x

Mean = Sum of all values/total number of values.

8.5 = 7.7 + 7.6 + 8.2 + x/4

8.5 = 23.5 + x/4

8.5 × 4 = 23.5 + x

34 = 23.5 + x

34 - 23.5 = x

10.5 = x

Therefore, weight of the fourth parcel will be 10.5 kg