The lifetime, x, in hours, of 70 light bulbs is shown in the table. Lifetime in Number
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The lifetime, x, in hours, of 70 light bulbs is shown in the table. Lifetime in Number of light bulbs hours 20-22 3 22-24 12 24-26 40 26-28 10 28-30 5 total. 70 Using the coding y x-1 estimate the standard deviation of the actual lifetime in hours of 20 a light bulb.
AppendixLO1
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Related Book For 
Edexcel As And A Level Modular Mathematics Statistics 1
ISBN: 978-0435519124
1st Edition
Authors: Keith Pledger Et Al
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