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The sum of of the mean and variance of a...

The sum of of the mean and variance of a binomial distribution is 15 and the sum of their squares is 117. the mean of the distribution is

A

6

B

9

C

3

D

12

Text Solution

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The correct Answer is:
B
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-MOCK TEST 2-MCQS
  1. The circumcentre of the triangle formed by the lines, xy + 2x + 2y + 4...

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  2. If sintheta=sinalpha, then

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  3. The sum of of the mean and variance of a binomial distribution is 15 a...

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  4. . Which one of the following is possible (a) sintheta = (a^2 + b^2)/(...

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  5. Let alphaandbeta be such that piltalpha-betalt3pi. If sinalpha+si...

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  6. If A is a square matrix of order 2xx2 such that A^(2)=O then,

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  7. If G is the centroid of a DeltaABC, then GA^(2)+GB^(2)+GC^(2) is equal...

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  8. If the equation ax^(2)+2hxy+by^(2)+2gx+2fy+c=0 represents a pair of pa...

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  9. Differentiate sin^(-1)((2x)/(1+x^2)) with respect to tan^(-1)((2...

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  10. If y^2 = p ( x ), a polynomial of degree 3, then 2 d/(dx) (y^3 (d^2y)/...

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  11. A bag A contains 4 green and 3 red balls and bag B contains 4 red and ...

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  12. Prove that: int0^(2pi)(xsin^(2n)x)/(sin^(2n)+cos^(2n)x)dx

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  13. The area bounded by the curve y=(x-1)(x-2)(x-3) and x-axis lying betwe...

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  14. The particular solution of the differential equation y'+3xy=x which pa...

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  15. logically equivalent to ~(~p=>q) is

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  16. Given a matrix A=[a b c b c a c a b],w h e r ea ,b ,c are real positiv...

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  17. The value of cos^-1 (cos12) - sin^-1 (sin 12) is

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  18. Let alpha=(pi)/(5) and A=[(cosalpha,sinalpha),(-sinalpha,-cosalpha)], ...

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  19. If in a triangle ABC, a^2+b^2+c^2=ca+ab sqrt3 then the triangle is

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  20. The difference of the tangents of the angles which the lines x^(2)(sec...

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