The average height in a group of 200 persons is 170 cm. After one year, the...
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The average height in a group of 200 persons is 170 cm. After one year, the height of some of them increased by 1 cm, and that of remaining increased by 3 cm. The average height now became 171.4 cm. Of how many persons the height has increased by 3 cm? 1. 40 2. 75 3. 50 4. 100 5. 80 The average height in a group of 200 persons is 170 cm. After one year, the height of some of them increased by 1 cm, and that of remaining increased by 3 cm. The average height now became 171.4 cm. Of how many persons the height has increased by 3 cm? 1. 40 2. 75 3. 50 4. 100 5. 80
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John E Freunds Mathematical Statistics with Applications
ISBN: 978-0134995373
8th edition
Authors: Irwin Miller, Marylees Miller
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