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Averages and Rounding Practice Questions 1 Flashcards

6 cards from real PARCC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is the mean of the data set: 45, 63, 27, 54, 36?

    Answer: 45

    Add all values: 45 + 63 + 27 + 54 + 36 = 225. Divide by the count of 5 values: 225 ÷ 5 = 45.

  2. A student scored 78, 84, 90, and 72 on four quizzes. What score does the student need on a fifth quiz to achieve an average of 82?

    Answer: 86

    The target sum for 5 quizzes at an average of 82 is 82 × 5 = 410. The current sum is 78 + 84 + 90 + 72 = 324. The needed score is 410 − 324 = 86.

  3. Round 7.3641 to the nearest tenth.

    Answer: 7.4

    The digit in the hundredths place is 6, which is ≥ 5, so the tenths digit rounds up from 3 to 4, giving 7.4.

  4. Six students scored 88, 94, 76, 82, 91, and 79 on an exam. What is their mean score?

    Answer: 85

    Sum of scores: 88 + 94 + 76 + 82 + 91 + 79 = 510. Divide by 6 students: 510 ÷ 6 = 85.

  5. Round 0.25648 to the nearest thousandth.

    Answer: 0.256

    The digit in the ten-thousandths place is 4, which is < 5, so the thousandths digit stays as 6, giving 0.256.

  6. A store's daily sales for one week were: $320, $415, $289, $376, $401, $358, and $312. What is the mean daily sales amount, rounded to the nearest dollar?

    Answer: $353

    Sum: 320 + 415 + 289 + 376 + 401 + 358 + 312 = $2,471. Divide by 7 days: 2,471 ÷ 7 = 353. The decimal portion is exactly 0, so no rounding adjustment is needed.