Answer: 45
Step-by-step explanation:
60 x .75. = 45
Answer: (14.4, 17.2)
Step-by-step explanation: We are to construct a 98% confidence interval for mean household usage of electricity.
We have been given that
Sample size (n) = 872
Sample mean (x) = 15.8
Population standard deviation (σ) = 1.8
The formulae that defines the 98% confidence interval for mean is given below as
u = x + Zα/2 × σ/√n...... For the upper limit
u = x - Zα/2 × σ/√n...... For the lower limit
Zα/2 = critical value for a 2% level of significance in a two tailed test = 2.33
By substituting the parameters we have that
For upper tailed
u = 15.8 + 2.33 × (1.8/√872)
u = 15.8 + 2.33 (0.6096)
u = 15.8 + 1.4203
u = 17.2
For lower tailed
u = 15.8 - 2.33 × (1.8/√872)
u = 15.8 - 2.33 (0.6096)
u = 15.8 - 1.4203
u = 14.4
Hence the 98% confidence interval for population mean usage of electricity is (14.4kwh, 17.2kwh)
I think it is 1920 because
Lenght ×width
12×16=72×10=1920
Hope this helps
Answer:
<u>p=4/3</u>
<u>p=2</u>
<u />
Step-by-step explanation:
3p²-10p+8=0
3p²-6p-4p+8=0
3p(p-2)-4(p-2)=0
(3p-4)(p-2)=0
<u>p=4/3</u>
<u>p=2</u>
<u />
Answer:
69 grams
Step-by-step explanation:
In a certain chemical, the ratio of zinc to copper is 3 to 13. A jar of the chemical contains 299 grams of copper. How many grams of zinc does it contain?
From the question, we know:
Zinc : Copper
3 : 13
We are told that : A jar of the chemical contains 299 grams of copper.
The grams of zinc it contains is:
3/13 = x/299
Cross Multiply
13 x = 3 × 299
x = 3 × 299/13
x = 897/13
x = 69 grams
It contained 69 grams of zinc
