I’m not sure abt 21 but 22 is the second one and the 4th one. So 2,4.
Answer:
Answer is Option 2
Step-by-step explanation:
Triangles equal to 180 degrees in total. So it is 55+54+x+74=180
The simplified version that I just wrote is Option 2
Answer:
9.5
Step-by-step explanation:
The standard deviation of the given data is 3.5
<h3 /><h3>How to calculate the standard deviation of data?</h3>
Standard deviation is used to determine the rate of dispersion of data with respect to the mean.
The formula for calculating the standard deviation of data is given as:

Given the data below:
10.4, 10.3, 11.7, 11.1, 8, 4.4, 2.6, 1.8, 2.5, 4.4, 7.3, 9.5
Using the stdevp calculator the standard deviation is calculated as:
σ = √12.405
σ = 3.5
Hence the standard deviation of the given data is 3.5
Learn more on standard deviation here: brainly.com/question/12402189