But according to what you said and 1 Lou's answer,

You should be allowed to choose two paths. One road is expected to be high, but the fluctuation is too large (variance), and the other road is expected to be small but stable. Is that so?

You said the expectation was 18.3, 18.7, and the variance was 0.09 and 2.25.

So I think this question should be chosen according to variance.

Why? Because the difference between 18.3 and 18.7 is very small (even if its unit is US dollars ... laugh), it is natural to choose a safe method at this time, which is in line with the thinking of businessmen.

Businessmen really want to pursue profits. There is a saying that "risks and benefits coexist", so businessmen may like to take risks, but they need to have enough benefits. If the benefits don't change much, who will bear the risk?