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There are 30 balls in the bag, 10 of which are blue. Adam takes 2 balls out of the bag without a replacement and calculated that there is a probability of 0.2 of both balls being blue. What percentage error did he make compared to the true probability?

True probability of 2 consecutive balls picked being blue: (10/30)*(9/29)=3/29 which is 0.1034 (4 d.p.) 3/29-100% 0.2-x% so, x=0.2*100/(3/29)= 193.3 (1 d.p.) therefore Adam's result is 93.3 % (1 d.p.) over t...
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Answered by Deimena K. • Maths tutor
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what is the basic principle behind case usage in Russian?

Russian has many different grammar rules which are completely unknown to most English speaking people. In English if we want to refer to an object in a sentence, we may use direct or indirect article (e.g. '...
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Answered by Alexander C. • Russian tutor
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Antibiotics can be used to protect our bodies from pathogens: What is a pathogen?

Pathogen: any microorganism (bacteria or virus) that can cause disease. anything that has a 'path' to disease. I will explain that often the question gives a clue to the answer to the question. The question ...
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Answered by Ayomide V. • Biology tutor
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Solve 7x=4(x-8)

The first thing you need to do to make this easier is to multiply out the brackets so that you can then move all the 'x' terms to one side and all the numbers to the other side. It would become: 7x=4x-32 You...
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Answered by Megha U. • Maths tutor
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Spanish GCSE Question: Difference between SER and ESTAR.

SER and ESTAR are both verbs which mean TO BE. SER is used when you are talking about things like nationality, where you are from, profession, time, price, physical traits and most importantly when describin...
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