Final answer:
Capital gains and income distributions are usually reported separately when calculating a mutual fund's yield, as they represent different types of returns from the investment. Some funds may combine them for convenience, but this isn't standard.
Step-by-step explanation:
When calculating a mutual fund's yield, capital gains and income distributions are typically reported separately because they represent different types of earnings. Capital gains are generated from the sale of a security at a price higher than its purchase price. Income distributions, on the other hand, often consist of interest or dividends that the fund earns from its investments. Mutual funds usually report these figures separately, allowing investors to understand the source of their returns. However, some funds might provide a combined figure for convenience or upon request, but this is not a standard practice, and as such, the most accurate response to the question would be that they are calculated separately (option b).