Following are the marks obtained, out of 100, by two students Ravi and Hashina in 10 tests:
Who is more intelligent and who is more consistent?
Given, Marks obtained by two students in 10 tests are given in Table.
To Find: Who is more intelligent and who is more consistent?
Explanation: Marks obtained by Ravi
Mean, 
SD (
)=
SD (
)=
SD (
)=
SD (
)=13.003
Coefficient of variation = 
Cv = 
For Hashima
Mean, 
SD (
)=
SD (
)=
SD (
)=
SD (
)=25.16
Coefficient of variation = 
Cv = 
Since, The coefficient of variation in mark obtained by Hashima is greater than the coefficient of Variation in mark obtained by Ravi,
Hence, Hasima is more consistent and intelligent
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