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The standard deviation of 32 numbers is ...

The standard deviation of 32 numbers is 5.If the sum of the numbers is 80,determine the sum of the squares of the numbers.

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UNITED BOOK HOUSE-ANNUAL EXAMINATION QUESTION PAPERS 2017-EXERCISE
  1. If (x+4)y=x.then show that x dy/dx+y(y-1)=0.

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  2. If a coin is tossed 3 times in succession,then find the probability of...

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  3. The standard deviation of 32 numbers is 5.If the sum of the numbers is...

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  4. For any three sets A,B and C ,prove that A-(BcupC)=(A-B)cap(A-C).

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  5. If sin^4alpha/a+cos^4alpha/b=1/(a+b),then show that sin^8alpha/a^3+cos...

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  6. If for a triangle ABC , cot A+cotB+cotC=sqrt3,then show that the trian...

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  7. If n in N,then prove by mathematical induction that 7^(2n)+2^3(n-1).3^...

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  8. If z=x+iy and (z-i)/(z+1)is purely imaginary,then show that the point ...

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  9. How many odd numbers of fve digits can be formed with the digits 3,6,7...

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  10. Prove that the middle term in the expansion of (1+x)^(2n)is(1.3.5........

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  11. If the ratio the sum of 1st n terms of two arithemtic series is (4n-13...

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  12. Find the equations of the lines passing thorugh the point (4,5)making ...

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  13. If the equation of the side BC of an equilateral triangle ABC is x+y=2...

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  14. A circle in the first quadrant touches both the axes its centre lies o...

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  15. Evaluate:underset(x rarr 0)(lim)((e^(x)-1)log(1+x))/(sin^(2)x)

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  16. Find from the first principle,the derivative of f(x)=sec2xat x=pi/8.

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  17. Prove by method of contradiction that sqrt5is an irrational number

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  18. Prove that truth table ~(pvq)=~p~q.

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  19. If 30 dates are named at random,find the probability that 5 of them wi...

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  20. calculate the mean deviation about median for the following data:

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