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The sum and sum of squares corresponding...

The sum and sum of squares corresponding to length x (in cm) and weighty (k. gm) of 50 plant products are given below:
`sum_(i=1)^(50) x_(i) = 212 , sum_(i=1)^(50) x_(i)^(2)=902.8 , sum_(i=1)^(50) y^(i)=261 , sum_(i=1)^(50) y_(i)^(2)=1457.6`
Which is more varying , the length or weight ?

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The sum and sum of squares corresponding to length x (in cm) and weight y (in gm) of 50 plant products are given below: sum_(i=1)^(50)x_(i)=212, sum_(i=1)^(50)x_(i)^(2)=902.8, sum_(i=1)^(50)y_(i)=261, sum_(i=1)^(50)y_(i)^(2)=1457.6 Which is more varying, the length or weight?

If n=10 , sum_(i=1)^(10) x_(i)=60 and sum_(i=1)^(10) x_(i)^(2)=1000 then find s.d

Knowledge Check

  • sum_(n=0)^oo((2i)/(3))^n=

    A
    `(9+6i)/13`
    B
    `(9-6i)/13`
    C
    9+6i
    D
    `9-6i`

  • sum_(i=1)^(n) sum_(j=1)^(i) sum_(k=1)^(j) 1, is equal to

    A
    `( n(n+1)(2n+1) )/( 6)`
    B
    `( ( n (n+1))/( 6) )^(2)`
    C
    `((n(n+1) )/(6) )^(2)`
    D
    `(n ( n+1)(n+2) )/( 6)`

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    sum_(1lei)sum_(ltjle n)ij=((sum_(i=1)^(n)i)^(2)-(sum_(i=1)^(n)i^(2)))/(2)

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