Answer:
The probability that a terminal will last 5 years or less is 0.8413
Step-by-step explanation:
Given:
μ= 4 years
σ= 1 year
Z=(x-μ)÷σ
Z=(5-4)÷1 = 1
The standard normal distribution table provides the probability that a normally distributed random variable Z, with mean equal to 0 and variance equal to 1, is less than or equal to z.
For z= 1 ⇒ P(z≤1)=0.8413
