The arithmetic mean of multiple voltage measurements is $\"\"$ .

The standard deviation is $\"\"$ .

Let the random variable $\"\"$ be multiple voltage measurements of the experiment. \ \

Find the probability of measurements is above $\"\"$

$\"\"$ .

Now calculate the Z-score for the given probability.

$\"\"$ ,

Where $\"\"$ is the number of voltage measurements. \ \

$\"\"$ is the mean and $\"\"$ is the standard deviation.

For $\"\"$ , Z-score is $\"\"$

$\"\"$

From the Z-score table, Area of the region when $\"\"$ is 0.8413.

$\"\"$ \ \

Percentage of voltage measurements above the $\"\"$ is $\"\"$