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A set of exam marks has mean 70, median 65, inter-quartile range 25 and standard deviation 15 marks. It is decided to subtract 10 from

A set of exam marks has mean 70, median 65, inter-quartile range 25 and standard deviation 15 marks. It is decided to subtract 10 from all the marks. For the new set of marks,

i) what is the new mean?

ii) what is the new median?

iii) what is the new inter-quartile range?

iv) what is the new standard deviation?

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