Q19 of 174 Page 608

The following table shows the weights of 12 workers in the factory.



















Weight(in kg)



60



63



66



69



72



No of workers



4



3



2



2



1



Find the mean weight of the workers.

Draw the table;







































Weight(x)



No. of workers



Fx



60



4



240



63



3



189



66



2



172



69



2



138



72



1



72




∑f = 12



∑fx = 771



Mean =


∑f = 12, ∑fx = 771



The mean weight is 64.25kg


More from this chapter

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16

Fill in the blanks in the following table:




























Marks



Frequency



Cumulative frequency



0-5



3



3



5-10



5



.......



10-15



8



.......



15-20



4



.......


 17

In the city, the weekly observations made on the cost of living index are given below.































Cost of living index



Number of weeks



140-160



5



150-160



10



160-170



20



170-180



9



180-190



6



190-200



2



Represent the above information in the form of a histogram.

 18

The mean of the marks scored by 50 students was found to be 39, Later on, it was discovered that a score was 43 was misread as 23, Find the correct mean.

 20

The heights (in cm) of 50 students of class are given below.























Height



156



154



155



151



157



152



153



No of students



8



4



10



6



7



3



12



Find the median height