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Actually, all the answers given (a, b, c, d) are wrong. The correct answer should be e. CANNOT BE DETERMINED For a, an arithmetic sequence refers to a sequence that the difference between consecutive terms ((n+1)th term - nth term) is constant. Obviously
There are 20 data in total. Q1 should be (5th datum + 6th datum)/2 Q2 should be (10th datum + 11th datum)/2 Q3 should be (15th datum +16th datum)/2 Your own calculation is wrong. Calculate yourself again. (Ans: IQR=10)
sec x
The general formula of an arithmetic sequence is An = A1 + (n-1)d where An refers to the nth term, A1 refers to the first term d refers to the common difference Try using the above formula

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