Question
The following table shows the distribution of marks (out
of 100) obtained by 60 students: The mean marks (using mid-points),Solution
Class mid-points (m): 0–20 → 10 20–40 → 30 40–60 → 50 60–80 → 70 80–100 → 90 Compute Σfm: f×m: 4×10 = 40 10×30 = 300 20×50 = 1000 16×70 = 1120 10×90 = 900 Total Σfm = 40 + 300 + 1000 + 1120 + 900 = 3,360 Total N = 60 Hence, Mean = Σfm / N = 3,360 / 60 = 56
Which of the following statements is correct?
I. If x = 12, y = –2 and z = –10, then x³ + y³
+ z³ = 720
II. If x + y = 48 an...
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If 3x + (1/3x) = 9 then find 27x³ + (1/27x³ ) = ?
What will come in the place of question mark (?) in the given expression?
(360 ÷ 24 + 105)% of ? = 48
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(p + 3) 2 + (q – 7) 2 + (r + 4)2 = 0, then find the value of p + q – r.
If, 2x + y = 13, and 2xy = 12, and 2x > y, then find the value of 8x³ – y³.
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