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hmm, what properties are you familiar with concerning the normal distribution?

also, how do you define the quartiles? and what do you have to use to do the calculations with?

and the interquartile range is the 50% that lies between them

ok so right now i got x=z(2.65)+25.3
how would i solve that?

a table of zscores might help ... or a ti83 or similar calculator to give us the z score of 25%