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****MATHEMATICS STATISTICS QUIZ-4**

Dear Readers,

As per analysis for previous years, it has been observed that students preparing for JEE MAINS find Mathematics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Mathematics due to their ENGINEERING background.

Furthermore, sections such as Mathematics are dominantly based on theories, laws, numerical in comparison to a section of Engineering which is more of fact-based, Physics, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced.

**MATHEMATICS STATISTICS QUIZ-4**

**Q2.**If the standard deviation of x

_{1},x

_{2},…x

_{n}is 3.5, then the standard deviation of -2x

_{1}-3,-2x

_{2}-3,…,-2x

_{n}-3 is

Solution

**Q4.**Standard deviation for first 10 even natural numbers is

**Q5.**If the two lines of regression are 4x+3y+7=0 and 3x+4y+8=0,then the means of x and y are

**Q9.**If a variable X takes values 0,1,2,…,n with frequencies proportional to the binomial coefficients

n C

_{0},n C_{1},n C_{2},…,n C_{n}, then the Var (X) is**Q10.**The coefficient of correlation (r) and the two regression coefficients b

_{yx},b

_{xy}are related as