Omar recorded the number of hours he worked each week for a year. Below is a random sample that he took from his data. 13, 17, 9
2 answers:
Answer:
the standard deviation=4.47
Step-by-step explanation:
We need to determine the standard deviation for the following set of numbers:
13 17 9 21
First, let's calculate the mean of these values.
The mean is derived by averaging the numbers and is represented as:
Next, we calculate the deviation of each number from the mean:
Deviation:
13-15=-2
17-15=2
9-15=-6
21-15=6
We then square these deviations:
4 4 36 36
Now, we determine the average of these squared values:
Finally, the standard deviation is the square root of the variance.
therefore, standard deviation=√(20)=4.47
You might be interested in
In this scenario, the first step is to assign variables.
We define:
x: time measured in minutes
y: distance covered.
The equations formulated are as follows:
For Kathleen:
For Arnob:
At the moment Arnob meets Kathleen, we have:
Next, we isolate x.
We now have:
Answer:
Arnob takes a total of 75 minutes to catch up to Kathleen:
d. 75