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Study the following bar graph and answer the question below.
Data from the graph:
What is the average weight of fruits bought?
75 kg
73 kg
72.14 kg
70 kg
72.14 kg
Sum the unit digits first: 7+5+9+5+1+3+5 = 35 (ends in 5). Total items = 7. 35/7 = 5. The unit digit of the result must be 5. Among options, only 75 ends in 5.
Quantities of fruits: Apple = 67, Orange = 85, Pineapple = 69, Banana = 95, Guava = 71, Pear = 53, Papaya = 85.
Average=Number of observations∑Quantities
Sum the unit digits first: 7+5+9+5+1+3+5 = 35 (ends in 5). Total items = 7. 35/7 = 5. The unit digit of the result must be 5. Among options, only 75 ends in 5.
Students often count 7 items but miscalculate the sum of the quantities (67+85+69+95+71+53+85 = 525).
Sum the quantities
Add the weights of all individual fruits represented in the bar graph.
Total=67+85+69+95+71+53+85=525
Count the number of items
Identify the number of fruit types listed on the x-axis.
n=7
Calculate average
Apply the arithmetic mean formula using the sum and count obtained.
Average=7525=75
C is correct because the sum of all fruit quantities is 525 and dividing by 7 types of fruit results in an average of 75 kg.
Averages often appear in DI (Data Interpretation) sets in banking and SSC exams. Always check the total count (n) correctly before dividing.
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