3 : 3,6,9,12,15,18,21,24,27,30
4 : 4,8,12,16,20,24,28,32,36
7: 7,14,21,28,35,42,49,56,63
9: 9,18,27,36,45,54,63,72,81
12/X=X/6
X^2=72
X= 8.48
X=8.5
18/y=y/12
Y-^2= 216
Y= 14.69
Y= 14.7
Answer:
the answer is below frum ed
Step-by-step explanation:
y= -6
Y= -4
Y= -3
Y= 0
Answer:
1.2192
Step-by-step explanation:
Answer: The sample mean ![(\overline{x}) = 517](https://tex.z-dn.net/?f=%28%5Coverline%7Bx%7D%29%20%3D%20517)
Step-by-step explanation:
The confidence interval is given by :-
Sample mean ± Margin of error
Given : The scores on a standardized test are normally distributed. If a random sample of standardized test scores is taken and the confidence interval is (497,537).
i.e. Sample mean - Margin of error = 497 ..(i)
Sample mean + Margin of error=537 ..(ii)
Adding (1) and (2), we get
2 (Sample mean) = 1034
⇒Sample mean = 517
Hence, the sample mean ![(\overline{x}) = 517](https://tex.z-dn.net/?f=%28%5Coverline%7Bx%7D%29%20%3D%20517)