Which of the following describes a compound event?
a. spinning a spinner and landing on the yellow section
b. rolling a die 4 times and getting two 5s
c. rolling 4 on a die
d. tossing a coin and getting heads
i'm thinking it's b

Option 'b' is correct.

Step-by-step explanation:

Since we know that

Compound events are those events that in which there is more than one possible outcome.

A. Spinning a spinner and landing on the yellow section.

There is only one possible outcome to get a yellow section.

C. Rolling 4 on a die.

There is only one possible outcome to get a 4 on a die.

D. Tossing a coin and getting heads

There is only one possible outcome to get a head on tossing a coin.

B. Rolling a die 4 times and getting two 5s.

There is more than one possible outcome on rolling a die 4 times and getting two 5s.

Hence, Option 'b' is correct.