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If ui = (xi-25)/10 sumfiui = 20 and sumf...

If `u_i = (x_i-25)/10 sumf_iu_i = 20` and `sumf_i = 100`, find `barx`.

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UNITED BOOK HOUSE-JHOWDANGA SAMMILANI HIGH SCHOOL-EXERCISE
  1. The lower and upper part of a solid object are hemispherical and conic...

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  2. The length of diagonal of each surface of a cube is 4sqrt2cm. Calculat...

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  3. If ui = (xi-25)/10 sumfiui = 20 and sumfi = 100, find barx.

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  4. The amount (Principal along with interest) of some money becomes Rs 49...

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  5. A and B have started a business together with capitals of Rs 6,200 an...

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  6. If one root of the equation ax^2+bx+c=0 (a!=0) is twice the other, tha...

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  7. Solve: a/(x-b)+b/(x-a) = 2(x!=b,a)

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  8. If x=(sqrt3+1)/(sqrt3-1) and xy=1 then find the value of (3x^2+5xy+3y^...

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  9. If 15 farmers can cultivate 18 bighas of land in 5 days, then calculat...

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  10. If a^2/(b+c)=b^2/(c+a)=c^2/(a+b)=1, show that 1/(1+a)+1/(1+b)+1/(1+c)=...

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  11. If the 1st and 2nd of the five numbers in continued proportion are 2 a...

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  12. Prove that opposite angles of a cyclic quadrilateral are supplementary

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  13. State and prove Pythagoras theorem.

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  14. N is the foot of the perpendicular form P to the diameter AB of the ci...

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  15. Two chords AB and CD of a cricle with centre O intersect at P. Prove t...

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  16. Draw a right angled triangle whose adjacent sides of the right angle a...

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  17. Geometrically find the value of 2sqrt7. (Only traces f construction a...

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  18. If the sum of two angles is 135^@ and their difference is Pi/2, then d...

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  19. If costheta= x/sqrt(x^2+y^2) show that x sin theta = y cos theta.

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  20. Find the value of cos^2 30^@-2cos^2 60^@-4sin^2 45^@+tan45^@.

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