Multiple choice

The mean of 19 observations is 4. If one more observation of 24 is added to the data, the new mean will be

  1. 4

  2. 5

  3. 6

  4. 7
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sum of 19 observations = 19 * 4 = 76. New sum = 76 + 24 = 100. New mean = 100 / 20 = 5.

AI explanation

Using the formula for combined mean, the original sum is 19 multiplied by 4, which equals 76. Adding the new observation of 24 gives a total sum of 100 across 20 observations. Dividing 100 by 20 yields the new mean of 5.

Keep practicing — related questions