A student scores the following marks in five tests : 45,54,41,57,43. His score is not known for the sixth test. If the mean score is 48 in the six tests, then the standard deviation of the marks in six tests is:
Let score of 6th test be x
then,
x=48
correct option (i)
Option 1)
Option 2)
Option 3)
Option 4)
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