## MATHEMATICS STATISTICS QUIZ-7

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.

Q1.

•

•

•

•

Solution

Q2.

•
•

•
•

•
•

•
•

Q3.

•  Only (1)
•  Only (2)
•  Both (1) and (2)
•  None of these

Q4. The GM of the series 1,2,4,8,16,…,2n is
•  2n+1/2
•  2(n+1)
•  2(n/2)
•  2n
Solution

Q5.

•  5
•  6
•  8
•  10
Solution
From the given table, it is clear that required mode=6

Q6. Mode of a certain series is x. If each score is decreased by 3, then mode of the new series is
•  x
•  x-3
•  x+3
•  3x

Q7.In a bivariate data Î£x=30,Î£y=400,Î£x2=196,Î£xy=850 and n=10. the regression coefficient of y on x is
• -3.1
•  -3.2
•  -3.3
•  -3.4
Solution

Q8.The mean deviation from mean of the observation a,a+d,a+2d,…a+2nd is
•

•

•

•

Solution

Q9.If Z=aX+bY and r be the correlation coefficient between X and Y, then ÏƒZ2 is equal to
•  a2 ÏƒX2+b2 ÏƒY2+2abrÏƒX ÏƒY
•  a2 ÏƒX2+b2 ÏƒY2-2abrÏƒX ÏƒY
•  2abrÏƒX ÏƒY
•  None of the above
Solution

Q10. The mean age of a combined group of men and women is 25 yrs. If the mean age of the group of men is 26 and that of the group of women is 21, then the percentage of men and women in the group is
•  60,40
•  80,20
•  20,80
•  40,60
Solution

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