Q1 of 40 Page 210

Weights of parcels in a transport office are given below.

Find the mean weight of the parcels.


Given is the frequency distribution table for ungrouped data.

We have



⇒ 25 number of parcels have weight each 50 kg,


34 number of parcels have weight each 65 kg,


And so on…


This also implies that,


Total weight of 25 parcels = 1250,


Total weight of 34 parcels = 2210,


And so on…


Mean of such ungrouped data is given by



⇒


⇒ [∵, ∑xifi = 17000 & ∑fi = 200]


⇒ Mean = 85


Thus, mean weight of the parcel is 85 kg.


More from this chapter

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10

The donations given to an orphanage home by the students of different classes of a secondary school are given below.


Find the mean, median and mode of the data.

 11

There are four unknown numbers. The mean of the first two numbers is 4 and the mean of the first three is 9. The mean of all four number is 15, if one of the four number is 2 find the other numbers.

 2

Number of families in a village in correspondence with the number of children are given below:

Find the mean number of children per family.


 3

If the mean of the following frequency distribution is 7.2 find value of ‘K’.





















X



2



4



6



8



10



12



F



4



7



10



16



K



3