Question: The power gain for 5 0 0 amplifiers is found to be normally distributed with a mean of 2 0 dB and a standard deviation

The power gain for 500 amplifiers is found to be normally distributed with a mean of 20 dB and a standard deviation of 2 dB . How many amplifiers have a gain greater than 20 dB ?
The power gain for 5 0 0 amplifiers is found to

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