9 प्रेक्षण का औसत 16 है । एक प्रेशक और सम्मीलित होने के कारण नया औसत 17 हो जाता है । 10 वा प्रेक्षण ज्ञात करे ?

Options

A. 9
B. 16
C. 26
D. 30

Answer

C

Explanation

According to the question
mean of 9 observation is =16
sum of all observation is =16x9=144
when one more observation included the new mean =17
Sum of 10 observations =10x17=170
`therefore ` `10^(th)` observation =170-144=26