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Q.

Determine the mean of the observations 425,430,435,......495.


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a

420

b

425

c

435

d

460  

answer is D.

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Detailed Solution

Given, observations are 425,430,435,......495.
⇒425,430,435,440,445,450,455,460,465,470,475,480,485,490,495.
Total number of observations =15
Sum of observation,=425+430+435+440+445+450+455+460+465+470+475+480+485 +490+495
=6900
We know that,
Mean =Sum of observationsTotal number of observations.
=690015
=460
Hence, option 4 is correct.
 
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Determine the mean of the observations 425,430,435,......495.