Answer:
Step-by-step explanation:
Given
There are 28 students in a class out of which
13 are boys so the remaining 15 are girls
Ratio of girls to boys in the class
Answer:
544,000
Step-by-step explanation:
Answer:
I found x for you, right there.
Answer:
The z-score is 
The percentile is 
Step-by-step explanation:
From the question we are told that
The data value is 0.6 standard deviations above the mean i.e 
Where 
is the population mean and 
is the standard deviation
Generally the z-score is mathematically represented as
=> 
=>
The percentile is obtained from the z-table and the value is
=>
Answer:
Here we can use the relationship:
Distance = time*speed.
When Jose walks, his speed is 4 mph.
Then if he walks for X hours, the distance that he will travel is:
D = 4mph*X
When Jose runs, his speed is 8mph.
Then if he runs for T hours, the distance that he will travel is:
D´ = 8mph*Y
And we know that he travels in total 20 miles, then we must have that:
D + D´= 20mi
This leads to:
4mph*X + 8mph*Y = 20mi
Where X is the time that he walked, and Y is the time that he runed.
Then the equation that represents the different amounts of times that Jose runs and walks is:
4mph*X + 8mph*Y = 20mi
Where we can not really find the solutions for Y and X, because there is only one equation and two variables.
