Answer:
The 20th percentile of coffee temperature is 155.4532 degrees Fahrenheit.
Step-by-step explanation:
We are given the following information in the question:
Mean, μ = 160 degrees
Standard Deviation, σ = 5.4 degrees
We are given that the distribution of temperature of coffee is a bell shaped distribution that is a normal distribution.
Formula:
We have to find the value of x such that the probability is 0.2
Calculation the value from standard normal z table, we have,
Thus,
![P_{20}=155.4532](https://tex.z-dn.net/?f=P_%7B20%7D%3D155.4532)
The 20th percentile of coffee temperature is 155.4532 degrees Fahrenheit.