Answer:
x>3, the last option with the open circle
Step-by-step explanation:
Answer:
Step-by-step explanation:
Given
Required
The complete dataset
The question has missing options (available online)
From the mean, we have:
This gives:
Cross multiply
<em>This means that the sum of all elements of the dataset is 720</em>
Next, we test the median
Since n = 10, then:
This implies that the median is the average of the 5th and 6th item.
So, we have:
Cross multiply
<em>This means that the 5th and 6th element add up to 148</em>
Also, we have:
<em>This means that 68 has to appear at least twice in the dataset</em>
<em>This implies that the difference between the highest and the least is 21.</em>
The dataset that satisfies the above condition is:
C
work:
75 is equal to 2x+15
75-15 = 60
60/2 = 30
x=30
Answer:
4.3 hours
Step-by-step explanation:
Let the number of hours Sally does a job = x
Let the number did hours Joan does a job be equal to y
Sally and Joan were able to dust the house in 3 hours together.
1/x + 1/y = 1/3
It takes Joan 10 hours to finish the same job alone.
Hence,
1/x + 1/10 = 1/3
1/x = 1/3 - 1/10
Least common dey = 30
1/x = 10 - 3/30
1/x = 7/30
Cross Multiply
x × 7 = 30
7x = 30
x = 30/7
x = 4.2857142857 hours
Approximately = 4.3 hours
Without help, it would take Sally 4.3 hours to finish the same job.
(0,2),(-2,-1),(2,5)
-3x+2y=2
+3x +3x
2y/2=3x+2/2
y=1 1/2x+2
Plug in numbers for x then solve for y