Answer:
The lower limit is 75.04
The upper limit is 78.96
Step-by-step explanation:
From the question we are told that
The sample size is 
The sample mean is 
The standard deviation is 
Given that the confidence level is 95% then the level of significance is mathematically represented as


The critical value for
obtained from the normal distribution table is

Generally the margin of error is mathematically represented as

=> 
=> 
The 95% confidence interval is mathematically represented as

=> 
=> 
Answer:
A
Step-by-step explanation:
- The values must decrease
- x∧12≥3x∧7≥4x³≥9x
How many times Kevin's savings are al's savings is 30 more
X=4 or X=-4 because 4(4)^2 does =64