Final answer:
To calculate the average of four cells B3, B4, B5, and B6, use the formula =AVERAGE(B3:B6).
Step-by-step explanation:
To calculate the average of four cells B3, B4, B5, and B6, you can use the formula =AVERAGE(B3:B6). This formula adds up the values in the specified range and divides by the number of cells in that range.