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In a bag there are only red, blue and green counters. (a) I am going to take a counter

Teacher's Notes Topic: Probability. Counter Probabilities. L6. In a bag there are only red, blue and green counters. (a) I am going to take a counter out of the bag at random. Complete the table below. Number of Counters. Colour of Counters. Probability. Red. 6.

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In a bag there are only red, blue and green counters. (a) I am going to take a counter

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  1. Teacher's Notes Topic: Probability Counter Probabilities L6 In a bag there are only red, blue and green counters. (a) I am going to take a counter out of the bag at random. Complete the table below. Number of Counters Colour of Counters Probability Red 6 What can you tell me about these two fractions? 1 5 Blue Green 6 What if this was ¼ ? Design another similar question. What if R = 9, G = 3 ? (b) Before I take a counter out of the bag, I put one extra blue counter into the bag. What effect does this have on the probability that I will take a red counter? Tick the correct box. The probability has increased. Turn the question on it's head. What could I do to make these happen? What else? What else? The probability has decreased. The probability has stayed the same It is impossible to tell.

  2. Number of Counters Colour of Counters Probability Red 6 1 5 Blue Green 6 Counter Probabilities In a bag there are only red, blue and green counters. (a) I am going to take a counter out of the bag at random. Complete the table below.

  3. The probability has increased. The probability has decreased. The probability has stayed the same It is impossible to tell. (b) Before I take a counter out of the bag, I put one extra blue counter into the bag. What effect does this have on the probability that I will take a red counter? Tick the correct box.

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