Calculate the interquartile range of the ordered data: 5, 13, 17, 20, 23, 26, 27, 29.

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How many different arrangements of all the letters of the word MISSISSIPPI are possible?
For events A and B: $P (A) = 0.6$ , $P (B) = 0.3$ and $P (A and B) = 0.1$ . Calculate $P (A or B)$ .
A and B are independent events with $P (A) = 0.8$ and $P (B) = 0.5$ . Calculate $P (A and B)$ .
In how many ways can a chairperson and a secretary be chosen from 6 club members if no member holds two posts?
For events A and B: $P (A) = 0.55$ , $P (B) = 0.45$ and $P (A and B) = 0.25$ . Calculate $P (A or B)$ .
In how many ways can a chairperson, a secretary and a treasurer be chosen from 7 club members if no member holds two posts?