<span> the answers are ...C. 16x – 4 and  D. 4(4x – 1) ...
Hope it helps !!!</span>
        
             
        
        
        
Answer:
$301 - $397
Step-by-step explanation:
Using the Empirical rule 
1) 68% of data falls within 1 standard deviation from the mean - that means between μ - σ and μ + σ . 
2)95% of data falls within 2 standard deviations from the mean - between μ – 2σ and μ + 2σ . 
3)99.7% of data falls within 3 standard deviations from the mean - between μ - 3σ and μ + 3σ .
From the above question, 
Mean = 349 , standard deviation = 24.
Confidence interval = 95%
Using 2)95% of data falls within 2 standard deviations from the mean - between μ – 2σ and μ + 2σ . 
μ – 2σ
= 349 - 2(24)
= 349 - 48 
= 301
 μ + 2σ 
349 + 2(24)
= 349 + 48
= 397
Therefore, according to the standard deviation rule, approximately 95% of the students spent between $301 and $397 on textbooks in a semester.
 
        
             
        
        
        
I believe the answer is “A”
        
                    
             
        
        
        
The mean is 73.44<span>
</span>You could've found this by adding up all the values in the data set, then dividing by how many numbers were in the data set!
66+81+60+72+79+83+60+92+68 = 661
661 ÷ 9 = 73.44
        
             
        
        
        
Randy's house number is 39
Explanation : We know that Randy's house number is either 29,39,59, or 79. Since his house is a composite number, we must pick the number from the following that is a composite number. 39 is a composite number, because 3 and 13 go into it