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**If the coefficient of variation of data pertaining to goals scored by two teams A and B in a football season are 2.5 and 7.2 respectively, then which of the following statements i strue?**

__Question 1.__- Team B is more consistent than team A.
- Two teams are equally consistent.
- Team A is more consistent than team B.
- The s.ds. of team A and team B are 125,172.

**Answer: Option C**

: C

We know that, lesser is the coefficient of variation, the data is more consistent.

Since C.V. of the team A is 2.5, which is less than the C.V. of team B, we can conclude that team A is more Consistent.

**The mean weight per student in a group of seven students is 55 kg if the individual weights of 6 students are 52, 58, 55, 53, 56 and 54; then weight of the seventh student is**

__Question 2.__- 55 kg
- 60 kg
- 57 kg
- 50 kg

**Answer: Option C**

: C

Total weight of 7 students is =55×7=385kg

Sum of weight of 6 students

=52+58+55+53+56+54=328kg

∴Weight of seventh student =385–328=57kg.

**The median of a set of 9 distinct observations is 20.5. If each of the largest 4 observations in the set is**

__Question 4.__increased by 2, then the median of the new set

- s increased by 2
- is decreased by 2
- is two times the original median
- remains the same as that of the original set

**Answer: Option D**

: D

We know that median is found when we arrange the observations in ascending or descending order. And if the number of observations are odd then it is the n+12th term.

Since on arranging 9 observations 5th will be the median.

On changing 4 of any side won't affect the median and it'll remain same.

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