Final answer:
The probability of making more than 20 long-distance calls during peak time cannot be accurately calculated without additional information such as standard deviation.
Step-by-step explanation:
The question pertains to the probability of a given event occurring. Specifically, it asks for the probability that employees at a small company make more than 20 long-distance phone calls during the peak time of day, given that the average number of calls is 20. To answer this, one would typically use a distribution model such as the Poisson or normal distribution depending on the context provided.
However, since the question does not provide enough information, such as the standard deviation or the time period during which the calls are considered to be in 'peak time,' a precise calculation cannot be made. Companies interested in monitoring call volumes during specific times might use data like this to assess phone usage and make decisions about staffing or phone plan adjustments.