Answer:
8
Step-by-step explanation:
Answer: p-value is 0.016.
Step-by-step explanation:
Since we have given that

Sample mean = 19.4
Sample size n = 50
Standard deviation = 2
We need to find the test statistic value which is given by

p-value is given by

Hence, p-value is 0.016.
Answer:
x+7 ≤ 20
Just take it step by step:
seven more than a number is a number plus 7 (x+7)- keep in mind we dont know what the number is so we use x to represent the number.
it then says it's equal to at most 20.
This means that it cant equal anything above 20 since 20 is the max. Therefore, it must be 20 and below that x+7 equals
x+7≤ 20
≤ -this symbol means less than or equal to
Step-by-step explanation: