Answer:
I think it may be the answer C
The equation is y=mx+b and b is the y-intercept so 5
Turn 20% into a decimal by dividing by 100 and get .20
then multiply 7,000 by .20 and get 1,400
so its a $1,400 discount so subtract 1,400 from 7,000 and get 5,600
then add 5,600 and 120 and get 5,720
So the total price is $5,720
Hope this helped! :))
Answer:
29.5+/-1.11
= ( 28.39, 30.61)
Therefore, the 90% confidence interval (a,b) =( 28.39, 30.61)
Step-by-step explanation:
Confidence interval can be defined as a range of values so defined that there is a specified probability that the value of a parameter lies within it.
The confidence interval of a statistical data can be written as.
x+/-zr/√n
Given that;
Mean x = 29.5
Standard deviation r = 5.2
Number of samples n = 59
Confidence interval = 90%
z-value (at 90% confidence) = 1.645
Substituting the values we have;
29.5+/-1.645(5.2/√59)
29.5+/-1.645(0.676982337100)
29.5+/-1.113635944529
29.5+/-1.11
= ( 28.39, 30.61)
Therefore, the 90% confidence interval (a,b) =( 28.39, 30.61)