Question

15.
Five years ago mean age of a family was 25 years what is the present mean age of the
family ? (AS-I)
Find the mode of all digits used in writing the natural numbers from 1 to 100 (AS-I)
16.​

Answer 1

Answer:

15. answer is 30

Let the number of family members be ′ x  ′

the average age of the family members 5 years ago is 25 years  

so the sum of age of all family members 5 years ago  =25x  

the sum of age of these family members now and after 5 years elapsed =25x (these added 5 years * no of family members)  =25x+5x=30x  

Sum of ages =30x  

no. family members be x  

Therefore, current, average age  =  sum of ages/no. of members =

x  = 30x   =30

16. answer is no mode

⇒  Mode is the number which appears most often in a set of numbers.  

⇒  There are not any repeated numbers from 1 to 100.

∴  There will be no mode.

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