Class 10 · Mathematics
Q1.Number of heartbeats per minute for 30 women: 65–68(2), 68–71(4), 71–74(3), 74–77(8), 77–80(7), 80–83(4), 83–86(2). The mean heartbeats using step-deviation (a=75.5, h=3) is:
Q2.In a frequency distribution, if all deviations dᵢ = xᵢ − a have a common factor h=5, and Σfᵢdᵢ = 50 with Σfᵢ = 10, the mean by assumed mean method (a=30) is:
Q3.Daily wages of 50 workers: 500–520 (12), 520–540 (14), 540–560 (8), 560–580 (6), 580–600 (10). The mean daily wage using step-deviation (a=550, h=20) is:
Q4.For the median of data 0–10(5), 10–20(x), 20–30(20), 30–40(15), 40–50(y), 50–60(5), total=60, given median=28.5, the values of x and y are:
Q5.From the household expenditure data, if modal class is 1500–2000 (f₁=40, f₀=24, f₂=33), the mode is:
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