What is the mean of the following data set: 5, 8, 12, 15, 20?
Correct!
Wrong!
The mean is calculated by summing the values and dividing by the number of values.
(5+8+12+15+20) /5= 60/5=12.
What is the median of the following data set: 3, 7, 9, 14, 21?
Correct!
Wrong!
The median is the middle value in a sorted data set. Here, 9 is the middle value.
What is the mode of the following data set: 4, 4, 6, 8, 9, 9, 9, 10?
Correct!
Wrong!
The mode is the value that appears most frequently. Here, 9 appears three times, more than any other number.
Which measure of central tendency is most appropriate to use for a skewed data distribution?
Correct!
Wrong!
The median is less affected by extreme values and skewed data than the mean.
What is the standard deviation of the following data set: 2, 4, 4, 4, 5, 5, 7, 9?
Correct!
Wrong!
The standard deviation measures the amount of variation in a data set. The exact calculation involves finding the square root of the variance (the average of the squared differences from the mean).