Answer:
Height = 4.78 unit approximately
Step-by-step explanation:
Volume of a one is given by the formula 1/3πr²h
So given that yhe volume of this cone is equal to 320Tr units
And the radius is 8 units.
Lets determine the height of the cone.
V= 1/3πr²h
But V = 320
r = 8
320 = 1/3((3.14)(8)²h
(320*3)/(3.14*64)= h
960/200.96= h
4.777= h
h = 4.78 unit approximately
Answer:
The null hypothesis is 
The alternative hypothesis is 
Step-by-step explanation:
From the question we are told that
The mean of method A is 
The standard deviation of method A is 
The mean of method B is 
The standard deviation of method B is 
An appropriate set of null and alternative hypothesis to determine whether Method A increases students points by more than 3 points is
The null hypothesis is
The alternative hypothesis is
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:
2=5 I don't think it's right but still trying
