The average noise level varies normally with mean of 30 decibels and standard deviation of 4...
The average noise level varies normally with mean of 30 decibels and standard deviation of 4 decibels. 95% of the time the noise level is below what level?
Question 4 options:
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30 – 1.96(4) |
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30 + 1.96(4) |
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30 + 2.576(4) |
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30 + 1.645(4) |
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The average noise level varies normally with mean of 30 decibels
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