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Find the Mean : Add all the numbers and divide by how many there are: 
Find Differences from the Mean : Subtract the mean from each number and square the result: 
Find the Average of the Squared Differences: Add these squared differences and divide by the number of values:
The monthly incomes of Rahul, Sanjay, and Vikram are in the ratio of 3:5:4, while their monthly expenditures are in the ratio of 6:5:7. Rahul earns Rs. ...
There are two friends, 'C' and 'D'. Income of 'C' is Rs. 54,000. 'D' saves 25% of his income and 'C' saves 40% of his income. If savings of 'D' are Rs. ...
Arjun Spends 20% of his income to food, then spends 15% of the remaining amount on rent, followed by 25% of what remains on trave...
The income of Amit is Rs. 12,000 greater than Bhuvan's income. Amit spends 75% of his income, whereas Bhuvan's expenditure is 80% of Amit's expenditure....
The monthly salary of Ankita is Rs. 21,300, and Mamta's monthly salary is Rs. 12,000. The ratio of their monthly expenditures is 9:5, and the ratio of t...
Mohit’s salary is ₹15,000 per month. He spends ₹5,000 on house rent, ₹2,000 on bills, and the rest of the amount is his monthly savings. Find hi...
Out of her monthly income of Rs. 25,000, Priya spent (Q - 10)% on rent, (Q + 15)% on others and saved Rs. 4,500. Find Q% of her monthly income.
