16% of students use the internet for more than 402 minutes.
Given that students use the internet for 300 minutes on average every day
102 as the standard deviation
P is the percentage of students who uses more than 402 minutes of internet.
To calculate the percentage:
As per the empirical rule,
The majority of people (68%) are within 1 standard deviation of the mean.
The mean is within 2 standard deviations of 95% of the population.
The mean and 3 standard deviations are shared by 99.7% of the population.
This will serve as an illustration of the percentage:
= P(X > 402)
= P(X > 30 + 1 × 102)
= (1 - 0.68) / 2
= 0.32/2
= 0.16
= 0.16 x 100
= 16%
Thus, the percentage of students who use the internet for more than 402 minutes is 16%.
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