To find the probability that a randomly selected student scored less than 82, we first need to find the z-score associated with a score of 82 using the z-score formula:
z = \frac{x - \mu}{\sigma}
where:
x = score (82),
\mu = mean (75),
\sigma = standard deviation (5).
Plugging in the values, we get:
z=\frac{82 - 75}{5}=\frac{7}{5}=1.40
So, the z-score for a score of 82 is 1.40.
Next, we look up the probability associated with a z-score of 1.4 using a standard normal distribution table or a calculator.
The probability of scoring less than 82 is the probability to the left of a z-score of 1.4. From the z-table, this probability is approximately 0.9192 or 91.92%.
Therefore, the probability that a randomly selected student scored less than 82 is approximately \boxed{91.92\%} .