What is the mean of the data 5, 8, 11, 14, 17, 20?
Answer and explanation
Correct answer: 12.5
Arithmetic mean = sum of all observations ÷ number of observations. Here, the sum is 5+8+11+14+17+20 = 75, and there are 6 observations. Thus, the mean is 75/6 = 12.5, so option B is correct. Getting 11.5 would indicate an error in calculating the total or the number of observations. Exam tip: Check both the sum and the total number of observations before dividing.
Frequently asked questions
What is the correct answer to this question?
12.5
Why is this the correct answer?
Arithmetic mean = sum of all observations ÷ number of observations. Here, the sum is 5+8+11+14+17+20 = 75, and there are 6 observations. Thus, the mean is 75/6 = 12.5, so option B is correct. Getting 11.5 would indicate an error in calculating the total or the number of observations. Exam tip: Check both the sum and the total number of observations before dividing.
Which subject and chapter does this question cover?
This is a Class 12 Mathematics question. Chapter: Statistics. Topic: Arithmetic Mean of Ungrouped Data.
