Correct option is B
The total sum of the 11 numbers = 11 × 7 = 77.
When 13 is removed, the new sum = 77 - 13 = 64.
The mean of the remaining 10 numbers = 64 ÷ 10 = 6.4.
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English
100 Questions
100 Marks
120 Mins
when the population standard deviation is known, the appropriate test is:
