The ages of five students are 18, 19, 19, 20 and . The mean age is 19.4. Find .
Answer and explanation
Correct answer: D. 21
- Step 1: The total of the ages is . Step 2. , so . Answer: 21. Why not the others: 19.4 is the mean, 97 is the total of all five ages, and 19 is the mode of the four known ages.
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