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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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Is it possible to prepare for an interview? If so what can I do?

Like any exam, it is absolutely essential that you prepare well for the Oxbridge interview process. This can be a relatively grueling admissions process and so tutors WILL be able to seperate the candidates ...
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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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What are the uses of the genitive case?

The genitive case is one of the most commonly used cases in the Russian language. Luckily for Russian scholars, it is fairy easy to master its usage: To denote possession - книга Машы (lit. the book of Masha...
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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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