Mean () = 8.5 minutes Standard deviation () = 2.2 minutes From these parameters, we can first calculate the z-score corresponding to 10 minutes using the formula: z = (X - ) / where X is the value we're interested in (10 minutes), is the mean (8.5 minutes), and is the standard deviation (2.2 minutes). Substitute the given values into the formula to find the z-score for 10 minutes. Once you have the z-score, you can then look up the corresponding cumulative probability from a standard normal distribution table or use software tools to find the probability that the time spent is less than 10 minutes. Remember to round your final probability to four decimal places