The diagram represents the same measurement taken by 2 different instrument, in this example: A. Instrument 1 has a higher standard deviation B. They have the same mean value C. Only instrument 2 has random error D. Instrument 2 is more precise E. none of the above Solution They have the same mean vale (Option B) Standard deviation of instrument 2 > instrument 1 so , Instrument is more precise hence option A & D are incorrect. Random Error is determined by Q-Q plot(plotting of values about mean line) so Option C is not applicable , Though it may be right if some more detail is given Both the curve have same height, so they have the same mean value.

1. The diagram represents the same measurement taken by 2 different instrument, in this example:
A. Instrument 1 has a higher standard deviation
B. They have the same mean value
C. Only instrument 2 has random error
D. Instrument 2 is more precise
E. none of the above
Solution
They have the same mean vale (Option B)
Standard deviation of instrument 2 > instrument 1 so , Instrument is more precise hence option A
& D are incorrect.
Random Error is determined by Q-Q plot(plotting of values about mean line) so Option C is not
applicable , Though it may be right if some more detail is given
Both the curve have same height, so they have the same mean value