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Write the data in a numerical order: 17 18 23 24 26 26.Since there is an even number of the data, the median is the average of the two numbers that are in the middle, (23 + 24)/2 = 23.5.The mode is 26 because it is the only number which appears twice.Mean = (17 + 18 + 23 + 24 + 26 + 26)/6 = 134/6 = 22.3333... = 22 3/9 = 22 1/3.
The standard deviation of 20 22 26 28 34: σ=5.4772
All of them except 23 and 29 which are prime numbers
20 because 26+14+20 = 60 and 60/3 = 20
To calculate the mean you add all of the numbers together, and then divide by how many numbers were added. In this case, the mean is 21.