RogueDragon707
05.07.2019 •
Mathematics
Use a calculator to find the mean and standard deviation of the data. round to the nearest tenth. 20, 16, 18, 9, 20, 16,14 question 2 options: mean = 16; standard deviation = 12.7 mean = 16.1; standard deviation = 12.7 mean = 15.9; standard deviation = 3.6 mean = 16.1; standard deviation = 3.6
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Ответ:
Mean = 16.1
Standard deviation = 3.6
Step-by-step explanation:
To find the mean of this data set, sum up all the values and divide it by the number of elements in the data set:
Mean = (20 + 16 + 18 + 9 + 20 + 16 + 14) / 7 = 16.1
To calculate the standard deviation, firstly subtract the mean from each value in the data set and square the result:
20 - 16.1 = (3.9)^2 = 15.21
16 - 16.1 = (-0.1)^2 = 0.01
18 - 16.1 = (1.9)^2 = 3.61
9 - 16.1 = (-7.1)^2 = 50.41
20 - 16.1 = (3.9)^2 = 15.21
16 - 16.1 = (-0.1)^2 = 0.01
14 - 16.1 = (-2.1)^2 = 4.41
Now add up all the squared values:
15.21 + 0.01 + 3.61 + 50.41 + 15.21 + 0.01 + 4.41 = 88.87
Now take a mean of this:
88.87 / 7 = 12.695
Square root this value to get the value of standard deviation:
= 3.6
Ответ:
Given the data values are 20, 16, 18, 9, 20, 16, 14.
Step A : Finding the Mean
Mean = (20 + 16 + 18 + 9 + 20 + 16 + 14) / 7 = 113/7 = 16.1
Mean = 16.1
Step B : Finding the squares of mean-deviation of data points.
(20-16.1)² , (16-16.1)² , (18-16.1)² , (9-16.1)² , (20-16.1)² , (16-16.1)² , (14-16.1)²
15.21 , 0.01 , 3.61 , 50.41 , 15.21 , 0.01 , 4.41
Step C : Finding mean of values from last step (Also called Variance).
Variance = (15.21 + 0.01 + 3.61 + 50.41 + 15.21 + 0.01 + 4.41) / 7 = 88.87/7 = 12.6957
Variance = 12.7
Step D : Finding square-root of Variance (Also called Standard Deviation)
Standard Deviation =
Standard Deviation = 3.6
Hence, option D is correct, i.e. mean = 16.1; standard deviation = 3.6
Ответ:
3 1/4 + 1 3/4= 5
3 1/4 + 1 3/4= 5the distance between 3 1/4 and -1 3/4 on the number line is 5
3 1/4 + 1 3/4= 5the distance between 3 1/4 and -1 3/4 on the number line is 5The answer is 5
Step-by-step explanation: