what is the first quartile and the third quartile and median of the data set 40, 45, 45, 55, 60, 90

We first find the median which is between 45 and 55,

therefore, the median is 50

the median of the LEFT half is the first quartile

therefore the first quartile is 45

the median of the RIGHT half is the third quartile

therefore the third quartile is 60

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