Verified answer

Answer:

Hence, the z-score is 1.300

Step-by-step explanation:

A z-score is a measure of how many standard deviations below or above the population mean. x is represent the score. μ is represent the mean and average. σ is represent the standard deviation.

Using the formula of z-score,

• z = x - μ/σ

Find z-score :

• z = x - μ/σ
• z = 120 - 100/15
• z = 20/15
• z = 4/3
• z = 1.3333
• z = 1.300