Answer:
Use the normal distribution if the population standard deviation is known.
Use the student's t distribution when the population standard deviation is unknown.
Explanation:
A mound-shaped distribution refers to the normal distribution.
A good sample size for testing against the normal distribution should be
n >= 30.
The condition for the sample size is satisfied.
However, we are not given the population standard deviation, therefore it is assumed to be unknown.
Therefore the student's t distribution should be used.
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Answer:
The temperature in Kelvin corresponding to F degrees Fahrenheit is 
Step-by-step explanation:
Given : One can convert temperature from Kelvin into Fahrenheit using the formula
.
To find : What is the temperature in Kelvin corresponding to F degrees Fahrenheit?
Solution :
Temperature from Kelvin into Fahrenheit is given by,

Writing Kelvin in terms of Fahrenheit,
Subtract 32 both side,

Divide by 95 both side,

Add 273 both side,

Therefore, The temperature in Kelvin corresponding to F degrees Fahrenheit is 
Answer:
Number line with open circle on 2 and shading to the right
Step-by-step explanation:
this is showing that it has to be greater than two and is going up on the number line