Answer:
<em>The correct option is : C. 3.4</em>
Step-by-step explanation:
The probability that a person shopping at a certain store will spend less than $20 is 0.2
That means, here 
Given that, the sample size
So, the Mean 
Thus, the mean number who spend less than $20 will be 3.4
Answer:
Step-by-step explanation:
Let x represent the number of spelling questions in the test.
Let y represent the number of vocabulary questions in the test.
Mrs morals wrote a test with 15 questions covering spelling and vocabulary. This means that
x + y = 15
Spelling questions (x) are worth 5 points and vocabulary questions (y) are worth 10 points. The maximum number of points possible on the test is 100. This means that
5x + 10y = 100 - - - - - - - - - - - 1
Substituting x = 15 - y into equation 1, it becomes
5(15 - y) + 10y = 100
75 - 5y + 10y = 100
- 5y + 10y = 100 - 75
5y = 25
y = 25/5 = 5
x = 15 - y = 15 - 5 = 10
-4K-7+5k
First. You have to plus the negative 4K in the 5K together which makes it K or
1K
So now you equation would be: k-7
Answer: x=-7 and x=9
Asummung you are solving for x
x+7=0
x=-7
-x+9=0
-x=-9
x=9
