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The following data gives the information on the observed lifetime (in hours) of $200$ electrical components :
Find the mean lifetime (in hours) of the electrical components.
Find the mean lifetime (in hours) of the electrical components.
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(Correct table)
Mean $= 50 + \frac{110}{200} \times 20$
Mean $= 61$
Thus the mean lifetime of the electrical components is $61$ hours.
Mean $= 50 + \frac{110}{200} \times 20$
Mean $= 61$
Thus the mean lifetime of the electrical components is $61$ hours.