The margin of error can be calculated using the t
statistic. The formula for margin of error is given as:
<span>Margin of error = t * s / sqrt (n) ---> 1</span>
Where,
t = the t score based on the given confidence level and
degrees of freedom
n = number of samples = 21
s = standard deviation = 7.1
Degrees of freedom = n – 1 = 21 – 1 = 20
Based on the standard probability tables for t, the t
score is:
t = 0.860
Substituting into equation 1:
margin of error = 0.860 * 7.1 / sqrt (21)
margin of error = 1.33
The range is:
range = 30.1 ± 1.33
range = 28.77, 31.43
Therefore the commute time to work is between 28.77 minutes
and 31.43 minutes.
Answer:
2.43 (units)
Step-by-step explanation:
Circumference of a circle is defined by C=2pi*r
Solving that equation for r --> 5.5 = 2* 3.14 * r
r=0.88 unit
Area of a circle = A= pi * r^2
Solve this equation by plugging in the r we just found. A = 3.14 * (0.88^2)
Answer: 2.43 units
Solve for <span>yy</span> in <span>2x+y=20<span>2x+y=20</span></span>How?
<span>y=20-2x<span>y=20−2x</span></span>
Substitute <span>y=20-2x<span>y=20−2x</span></span> into <span>-5y=-6x+12<span>−5y=−6x+12</span></span>How?
<span>-5(20-2x)=-6x+12<span>−5(20−2x)=−6x+12</span></span>
Solve for <span>xx</span> in <span>-5(20-2x)=-6x+12<span>−5(20−2x)=−6x+12</span></span>How?
<span>x=7<span>x=7</span></span>
Substitute <span>x=7<span>x=7</span></span> into <span>y=20-2x<span>y=20−2x</span></span>How?
<span>y=6<span>y=6</span></span>
Therefore,
<span>x=7<span>x=7</span></span>
<span>y=6<span>y=6</span></span>
<span>
</span>
In 9 hours
john earns $67.5
becky earns $74.25
becky earns $6.75 more than john
If you divide 35 by 60 and multiply by 100 you get 58.3%
Hope this helps!!!!