Help i don’t know the answer ;-;
1 answer:
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A=L*W
Let w be width
L=(w+6)
40=(w+6)*w
40=
=0
w(w+10)-4(w+10)=0
(w-4)(w+10)=0
w=4
Length= 10 units
Width=4 units
Let w be width
L=(w+6)
40=(w+6)*w
40=
w(w+10)-4(w+10)=0
(w-4)(w+10)=0
w=4
Length= 10 units
Width=4 units
Answer:
Step-by-step explanation:
Given : Level of significance :
Then , significance level :
Since , sample size : , which is small sample (n<30) so the test applied here is a t-test.
Degree of freedom=
Using t-distribution table , Critical value :
Sample mean :
Standard deviation:
The confidence interval for population mean is given by :-
Hence, a 99% confidence interval for the population mean.=