4x + 3y = 19 3x - 5y = 7
1 answer:
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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
=>
=>