Since variance is always non-negative only option 3 can happen.
In an election between two candidates, winner got 60% of total valid votes. If total number of votes cast were 1200 out of which 5% were invalid, then f...
Rajesh spent 48% of his monthly income on food and 52% of the remaining of study. If total monthly savings (after spending on food and study) of Rajesh ...
The total number of students in a college is 13,200. If the number of male students increases by 30% and the number of female students increases by 20% ...
The salary of a man decreased from Rs. 20000 per month to Rs. 15000 per month. . Find the decrease percent.
In a colony, there are 110 APL families and 50 BPL families. Each APL and BPL family got blankets equal to 20% and 75%, respectively of total number of ...
The population of the town is 270,000 4/9th of them are males and the rest are females. 50% males and 40% females are married. Find the unmarried popula...
A man spends 22% and 20% of his monthly salary on rent and transportation, respectively. Out of the remaining money, he spends 33% on food and 50% on en...
A gets 36% of the full marks in an exam and fails by 90 marks. B gets 39% of the full marks in the same exam and he also fails by 75 marks. What is the ...
Rahul saves Rs. 7200 more if he spends 65% of his income instead of 85%. Find the savings of Sumit whose income is 25% more than that of Rahul, and spen...
Out of 400 students in school, 40% students like samosa only and 20% students like samosa and momos both. If 30% students don’t like any snacks then f...
