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Sample Mean and Standard Deviation

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1. Two brands of car batteries both carrying 6 year warranties, were sampled and tested under controlled conditions. Five of each brand failed after the number of months shown. Calculate a). both sample means and b) both sample standard deviations. Decide c) which brand battery lasts longer and d0 which brand has the more consistent lifetime.

Brand A: 73, 74, 76, 63, 64
Brand B: 71, 63, 71, 60, 67

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Solution Summary

The solution gives detailed steps on calculating the sample means and sample standard deviations for given sample data.

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For brand A
mean=(73+74+76+63+64)/5=70 ...

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