Final answer:
The z-score corresponding to x = 25 is -1.
Step-by-step explanation:
A z-score represents the number of standard deviations a value is above or below the mean in a normal distribution. To find the z-score corresponding to x = 25 in a normal distribution with a mean of 30 and a standard deviation of 5, we can use the formula:
z = (x - mean) / standard deviation
Plugging in the values, we get:
z = (25 - 30) / 5 = -1
Therefore, the z-score corresponding to x = 25 is -1.