A coin is tossed 5 times. What is the probability that head appears an even number of times?

Explanation

To find the probability that a head appears an even number of times when a coin is tossed 5 times, we can use the binomial distribution.

### Step-by-Step Solution:

1. **Identify the parameters of the binomial distribution**:
- Let \( n \) be the number of trials (coin tosses). Here, \( n = 5 \).
- Let \( p \) be the probability of success (getting a head in one toss). Since the coin is fair, \( p = \frac{1}{2} \).
- The probability of failure (getting a tail) is \( q = 1 - p = \frac{1}{2} \).
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