Question

A large company wishes to obtain its own bench mark for one-day expenses in Moscow. To do this, it records the one-day travel expenses for a random sample of 35 executives visiting Moscow. The mean and the standard deviation of the sample are $538 and $41. Furthermore, a histogram shows that the distribution is bell-shaped. Use empirical rule (that means if you use other method such as the standard normal table, your answer will be graded as wrong!) to answer the following questions:

1. What are the boundaries of the interval that contains about 68.26% of expenses?
2. Find how many percent of the expenses are below $497?
3. Find how many percent of the expenses are above $456?
4. Find how many percent of the expenses are between $497 and $620?

Answer 1