Question: A number line labeled x Overbar = sample mean battery life (hours) goes from 15.345 to 20.655. A normal distribution has a maximum at 18.

A number line labeled x Overbar = sample mean battery life (hours) goes from 15.345 to 20.655. A normal distribution has a maximum at 18. Mean: 18 hours Standard deviation: StartFraction 2.8 Over StartRoot 10 EndRoot EndFraction 0.885 hours Determine the probability that the sample mean battery life is 19 hours or less if the manufacturer's claim is true. Use this standard Normal table to calculate this probability. What is the z-score for 19 hours? Round to 2 decimal places. What is the area under the Normal curve to the left of 19 hours? Round to 4 decimal places

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