Question
Assume that there are equal numbers of male
and female students in a university. Of all male students, 10 per cent major in economics; and of all female students, 5% major in economics. What is the probability that a student selected at random will be an economics student?Solution
The average of six numbers is 82. When two more numbers are included, the average increases by 4. Find the average of the numbers included.
Ashish bought 25 notebooks for Rs.1230 from shop A and 12 notebooks for Rs.805 from shop B. What is the average price he paid per book?
In an examination, the average marks obtained by the students is 75. After correcting the quantitative mistakes, the average of 100 students is reduced...
- The first six days of a week had an average rainfall of 90 cm, while the last six days recorded an average of 98 cm. If the weekly average rainfall was 95 ...
Daksh bought 21 notebooks for Rs.1260 from shop A and 14 notebooks for Rs.1190 from shop B. What is the average price he paid per book?
The average age of a group of 70 students is 14 years. If three students whose ages are 22years, 20years, ________ years is replaced with three new stud...
- The average of 6 values is 40. If two more values with an average of 'x' are added, the overall average increases by 20%. Find the value of 'x'.
The average age of A and B is 22 years. If A is to be replaced by C, the average would be 20 years. The average age of C and A is 23 years. Find the age...
A mixture contains oil and water in the ratio 7:5. When 70% of this mixture is replaced with 153 litres of water, the ratio becomes 8: 13. Than, what wi...
Average of 20 numbers is 90. Average of first 8 numbers is 103 while average of last nine numbers is 40. If ninth number is 25% less than the tenth numb...
