Question detail
Use a checking method for this problem: final-answer check: a bag has 2 blue counters and 27 red counters. Find the probability of choosing a blue counter. State the final answer and verify it against the information in the question.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Solving equations and inequalities
Question
Use a checking method for this problem: final-answer check: a bag has 2 blue counters and 27 red counters. Find the probability of choosing a blue counter. State the final answer and verify it against the information in the question.
Answer
A valid checked answer is 0.069. The method is: Probability uses favourable outcomes and total outcomes. The favourable outcomes are 2. The total outcomes are 29. Divide 2 by 29 and round to three decimal places. 0.069 The final line agrees with the canonical answer.
Explanation
calculator check keeps the canonical answer 0.069 fixed before the model answer is written, so the worked solution and final answer agree.
Common mistake
Algebraic modelling common mistake 1
Writing a final answer without showing the method that justifies it. This can weaken answers for: [Higher only] Derive and solve two simultaneous equations from a contextual problem..
Show the method first, then give the final answer in the required form. Apply this directly to Algebraic modelling.
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