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Ex 14.1, 4 - Thirty women were examined in a hospital by

Ex 14.1, 4 - Chapter 14 Class 10 Statistics - Part 2
Ex 14.1, 4 - Chapter 14 Class 10 Statistics - Part 3

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Ex 14.1, 4 Thirty women were examined in a hospital by a doctor and the number of heart beats per minute were recorded and summarized as follows. Fine the mean heart beats per minute for these women, choosing a suitable method. Mean(π‘₯ Μ…) = a + h Γ— (βˆ‘β–’π’‡π’Šπ’–π’Š)/(βˆ‘β–’π’‡π’Š) Where a = Assumed mean h = Class interval = 75.5 = 68 – 65 = 3 Also, βˆ‘β–’π’‡π’Š = 30 βˆ‘β–’π’‡π’Šπ’–π’Š = 4 Putting values in formula Mean(𝒙 Μ…) = a + h Γ— (βˆ‘β–’π’‡π’Šπ’–π’Š)/(βˆ‘β–’π’‡π’Š) π‘₯ Μ… = 75.5 + 3 Γ— 4/30 π‘₯ Μ… = 75.5 + 0.4 𝒙 Μ… = 75.9 Thus, Mean heartbeats per minute is 75.9

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