$\"\"$

The probability of a compound event is the sum of the probabilities of each individual event.

The probability of a customer ordering fewer than 3 times per month is the sum of the probability

of randomly 2 times per month plus the probability of randomly one time per month.

$\"\"$ (Sum of individual probabilities)

$\"\"$ (Substitute)

$\"\"$ (Add: $\"\"$ ) $\"\"$

The solution is $\"\"$ .