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In a bag of 25 coloured balls, 7 are orange, 6 are yellow and the rest are green. Laura picks out a ball and records its colour but doesn't return it to the bag, she then repeats this twice more. What is the probability of Laura getting 3 yellow balls?

Answer: 1/115 The easiest way to solve this problem is to draw part of a tree diagram to see the probabilites of each colour being picked each time Laura pulls a ball out of the bag (a full diagram isn't nee...
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Answered by Manon S. • Maths tutor
3696 Views

What is productive efficiency?

productive efficency is seen at the lowest point of average cost, which is also where the marginal cost curve cuts the average cost curve. Productive efficiency means that all resources have been allocated e...
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Answered by Isini A. • Economics tutor
4123 Views

What are the main differences between meiosis and mitosis?

Both mitosis and meiosis are processes of dividing a diploid cell, however there are a number of key differences. Mitosis results in two genetically identical, diploid, daughter cells and takes place during ...
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Answered by Kara E. • Biology tutor
22367 Views

How do I rationalised and simplify surds?

Say I have a fraction with 2 surds, such as √10 / √6. To rationalise this, we need to get the dominator (bottom fraction) to be an integer. As √10 / √6 x 1 still gives √10 / √6, and we can write 1 as √6 / √6...
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Answered by Tabitha G. • Maths tutor
5031 Views

Ian earns £420 a week after a 5% rise. What was his pay before?

Ian had a 5% rise, so £420 = 105% of his original pay To find 1% of his original earnings, divide £420 by 105. Multiply this by 100 to find his old pay: 1% of his original earnings = 420/105 = £4 Original ea...
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Answered by Haris S. • Maths tutor
8021 Views