Answer:
the answer is 19
Step-by-step explanation:
8+6=14
14+5=19
Answer:
131.2 ;
12.8 ;
(118.4, 144)
Step-by-step explanation:
Given :
X = 131.2, s=55 , and n= 50
Point estimate of the mean :
Since, sample size is large (n > 30) ; the sample mean = population mean according to the center limit theorem :
Margin of Error = Zcritical * s / sqrt(n)
Zcritical at 90% = 1.645
Margin of Error : 1.645 * (55 / sqrt(50))
Margin of Error : 1.645 * 7.7781745
Margin of Error = 12.795097
Margin of Error = 12.8
The confidence interval (C.I) :
C.I = x ± margin of error
C. I = 131.2 ± 12.8
(131.2 - 12.8) ; (131.2 + 12.8)
(118.4, 144)
Answer:
Step-by-step explanation:
So we have the equation:
Subtract 7 from both sides:
Divide both sides by 3:
So, the value of w is 4.
And we're done!
Answer:
about 25.13
Step-by-step explanation:
The formula of the circumference is 2pi * r
half of the diameter is r, r is the radius
8/2 = 4
2* pi*4
2*4 = 8
8*pi = ~25.13
