In a class test, the sum of Shefali's marks in Mathematics and English is 30. Had she got 2 marks more in Mathematics and 3 marks less in English , the product of their marks would have been 210. Find her marks in the two subjects.

Had Ajita scored 10 more marks in her mathematics test out of 30 marks, 9 times that number would have been the square of her actual marks. How many marks did she get in the test?

Marks scored by 30 students of 10th standard in unit test of mathematics is given below. Find the variance of the scores:

In a Mathematics test, the following marks were obtained by 40 students. Arrange these marks in a table using tally marks. (a)Find how many students obtained marks equal to or more than 7.

A teacher analyses the performance of two sections of students in a mathematics test of 100 marks given in the following table. Find the probability that a student obtained less than 20 in the mathematics test.

A teacher analyses the performance of two sections of students in a mathematics test of 100 marks given in the following table. Find the probability that a student obtained marks 60 or above.

Form the pair of linear equations in the following problems and their solutions (if they exist) by any algebraic method. Yash scored 40 marks in a test, getting 3 marks for each right answer and losing 1 mark for each wrong answer. Had 4 marks been awarded for each correct answer and 2 marks been deducted for each incorrect answer, then Yash would have scored 50 marks. How many questions were there in the test?

Ravi obtained 70 and 75 marks in first two unit test. Find the minimum marks he should get in the third test to have an average of at least 60 marks.

A school conducted a test (of 100 marks) in English for studentt of Class X. The marks obtained by 1tudenll are shown l.n the following table : find the modal marks.

In a class test (+3) marks are given for every correct answer and (-2) marks are given for every incorrect answer and no marks for not attemption any question:- Mohini scores -5 marks in this test, though she has got 7 correct answers. How many questions has she attempted incorrectly?