The width of each of five continuous classes in a frequency distribution is 5 and the lower class limit of the lowest class is 10. The upper class limit of the highest class isA. 15B. 25C. 35D. 40

The width of each of five continuous classes in a frequency distributi

1.	The width of each of five continuous classes in a frequency distribution is 5 and the lower class limit of the lowest class is 10. The upper class limit of the highest class isA. 15B. 25C. 35D. 40
Answer» Correct Answer - C Let x and y be the upper and lower class limit of frequency distribution. Given, width of the class =5 `rArr x-y=5` ……….(i) Also, given lower class (y)=10 On putting y=10 in Eq. (i), we get `x-10=5 rArr x=15` So, the upper class limit of the lowest class is 15. Hence, the upper limit of the highest class = (Number of continuous classes x Class with + Lower class limit of the lowest class) `=5 xx 5 + 10 = 25+10=35` Hence, the upper class limit of the highest class is 35. Alternate method After finding the upper class limit of the lowest class, the five continuous classes in a frequency distribution with width 5 are 10-15, 15-20, 20-25, 25-30, and 30-35. Thus, the highest class is 30-35, Hence, the upper limit of the class is 35.