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Sophia has a bag with 3 purple marbles and 4 blue marbles in it. She is going to randomly draw a marble from the bag 280 times, putting the marble back in the bag after each draw.
Complete the following statement with the best prediction.
Sophia will draw a purple marble...
Choose 1 answer:
(A) Exactly 120 times
(B) Close to 120 times but probably not exactly 120 times
(c) Exactly 160 times
(D) Close to 160 times but probably not exactly 160 times

Sophia has a bag with 33 purple marbles and 44 blue marbles in it. She is going to randomly draw a marble from the bag 280280 times, putting the marble back in the bag after each draw.\newlineComplete the following statement with the best prediction.\newlineSophia will draw a purple marble...\newlineChoose 11 answer:\newline(A) Exactly 120120 times\newline(B) Close to 120120 times but probably not exactly 120120 times\newline(C) Exactly 160160 times\newline(D) Close to 160160 times but probably not exactly 160160 times

Full solution

Q. Sophia has a bag with 33 purple marbles and 44 blue marbles in it. She is going to randomly draw a marble from the bag 280280 times, putting the marble back in the bag after each draw.\newlineComplete the following statement with the best prediction.\newlineSophia will draw a purple marble...\newlineChoose 11 answer:\newline(A) Exactly 120120 times\newline(B) Close to 120120 times but probably not exactly 120120 times\newline(C) Exactly 160160 times\newline(D) Close to 160160 times but probably not exactly 160160 times
  1. Calculate Total Marbles: Sophia has a total of 33 purple marbles and 44 blue marbles, making it 3+4=73 + 4 = 7 marbles in total.
  2. Calculate Probability of Drawing Purple Marble: The probability of drawing a purple marble in a single draw is the number of purple marbles divided by the total number of marbles, which is 37.\frac{3}{7}.
  3. Predict Number of Purple Marbles in 280280 Draws: To predict how many times Sophia will draw a purple marble in 280280 draws, we multiply the probability of drawing a purple marble by the total number of draws: (37)×280(\frac{3}{7}) \times 280.
  4. Calculate Expected Number of Purple Marbles: Calculating the expected number of times Sophia will draw a purple marble gives us (37)×280=3×40=120(\frac{3}{7}) \times 280 = 3 \times 40 = 120 times.
  5. Considerations for Actual Draws: While the calculation gives us an exact number, in practice, the actual number of times Sophia draws a purple marble will likely be close to 120120 but not exactly 120120 due to the randomness of each draw.

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