Home
Class 12
MATHS
The line of regression marks in economic...

The line of regression marks in economics (X) for marks in mathematics (Y) for a class of 50 students is 3y - 5x+180 = 0. Average score in mathematics is 44 and variance of marks in economics is `9/16th` , of variance of marks in mathematics. Find the average score in economics and also the coefficient of correlation between marks in economics and mathematics.

Text Solution

Verified by Experts

The correct Answer is:
Average scorse in Economics = 62.4 ; r(X,y) = 0.8
Promotional Banner

Topper's Solved these Questions

  • MODEL TEST PAPER - 3

    ICSE|Exercise SECTION - B|10 Videos

  • MODEL TEST PAPER - 2

    ICSE|Exercise Section - C|10 Videos

  • MODEL TEST PAPER - 4

    ICSE|Exercise SECTION - C|10 Videos

Similar Questions

Explore conceptually related problems

For 50 students of a class, regression equation of marks in statistics (x) on marks in Accountancy (y) in 3y-5x+180=0 . The mean in Accoutancy is 44 and the variance of marks in statics is 9/16 of the varience of marks in Accountancy. Find the mean marks in Statistics and coefficient of correlation between marks in two subjects.

Anjali scores 100 marks in Mathematics and x marks in Science. what is her total score in Science and Mathematics?

The two lines of regression are x+ 2y- 5= 0 and 2x + 3y - 8=0 and the variance of x is 12. Find the variance of y and the coefficient of correlation.

The score of Ishita in Mathematics is 25 more than the two third of her score in Science. If she scored x marks in Science, determine her score in Mathematics.

The two lines of of regressions are x+2y-5=0 and 2x+3y-8=0 and the variance of x is 12. Find the variance of y and the coefficient of correlation.

Savio scores x marks in Mathematics, y marks in Physics, and z marks in Chemistry. Calculate his total score in all three subjects.

Calculate Spearman's rank correlation coefficient between the marks in Mathematics and Accountancy by 9 students.

The following table shown the mean and standard deviation of the marks of Mathematics and Physics scored by the students in a school : The correlation coefficient between the given marks is 0.86 . Estimate the likely marks in Physics if the marks in Mathematics are 92 .

In a class test, the sum of Shefalis 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.

In a class test, the sum of Shefalis 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.