Tommy is repeating a series of digits in the order in which he heard an experimenter read them. the experimenter is testing the capacity of tommy's memory. tommy should be able to repeat about digits correctly.
a. short-term; 4b. short-term; 7c. sensory; 4d. sensory; 7

short-term

7

Explanation:

Short-term memory is the capacity for holding, but not manipulating, a small amount of information in mind in an active, readily available state for a short period of time.

The human brain can only hold about seven pieces of information for less than 30 seconds.

As an example:

Tommy is repeating a series of digits in the order in which he heard an experimenter read them. The experimenter is testing the capacity of Tommy's short term memory. Tommy should be able to repeat about 7 digits correctly.