33.68
27.4
x
--------
922.832
Answer: Because all individuals in the sample have the same job, so the sample is biased.
Step-by-step explanation:
Ignoring the fact that 30 is a small sample for a large city, we already know that all the people in the sample has the same profession.
Now, we can expect that two dentists win have around the same income, but not all the residents in the city are dentists
A lot of them work in fast food, others may be lawyers, others may be freelancers.
We have a lot of jobs where the income does not coincide with the average income of a dentist, so with the sample of 30 dentists we are not actually representing all the other possible jobs that there are in the city.
If we want a sample that represents the income of all the residents, we should have a random sample (so the sample is not biased, like in this case).
Let x be the cost of each bed sheet and y be the cost of each of the towel. The system of linear equations that best represent the given condition is,
38x + 61y = 791.50
54x + 50y = 923
Solving for x and y in the equation gives, x = 12 and y = 5.5. Thus, one bedsheet costs $12 and each towel costs $5.5.
Given:
The inequality is
To find:
The missing step in solving the given inequality.
Solution:
Step 1: The given equation.
Step 2: Subtract 8x from both sides.
Step 3: Add 4 on both sides.
Step 4: Divide both sides by -2 and change the sign of inequity as we divide the inequality by a negative number.
Therefore, the missing step is .
Answer:
264.20
Step-by-step explanation:
Let X be the pregnancy length (in days)
Then X is N(266,16)
We can convert X to Z by
is N(0,1)
25th percentile for Z is
-0.675
Convert back to x score
25th percentile is 264.20
