Question

The results obtained in the experiment to measure the length of the specimen by three different scientists, John, Annie, and Rebecca are given below.

Scientist	John	Annie	Rebecca
Experiment results (in mm)	$0.758$	$0.785$	$0.779$

Choose the incorrect statement.

• A. The sum of John, Annie, and Rebecca’s results is $2.322$ mm.
• B. John’s result is $0.027$ mm less than Annie's result.
• C. The sum of John and Rebecca's results is $0.751$ mm more than Annie’s result.
• D. Annie’s result is $0.006$ mm more than Rebecca’s result.

Answer 1

The correct option is C The sum of John and Rebecca's results is $0.751$ mm more than Annie’s result.

Difference between Annie’s result and John’s result $=0.785-0.758=0.027$ mm


So, John’s result is $0.027$ mm less than Annie’s result.
Statement given in option A is correct.
Difference between Annie’s result and Rebecca’s result $=0.785-0.779=0.006$ mm


So, Annie’s result is $0.006$ mm more than Rebecca’s result.
Statement given in option B is correct.
The sum of John’s result and Rebecca’s result $=0.758+0.779=1.537$ mm


Subtracting Annie’s result from the sum $=1.537-0.785=0.752$ mm

So, the sum of John and Rebecca’s results is $0.752$ mm more than Annie’s result.
Statement given in option C is incorrect.
The sum of John, Annie, and Rebecca’s results $=0.779+0.785+0.758=2.322$ mm


So, the sum of John, Annie, and Rebecca’s results is $2.322$ mm. Hence, the statement given in option D is also correct.

So, option C is the correct answer.