Each of the numbers in the following calculation represents a quantity measured by a student in the laboratory. P = After performing the calculation,the student's calculator appeared as shown below:
To the correct number of significant figures what is the value of P?
A)2
B)2.43
C)2.430
D)2.430094

Question

Each of the numbers in the following calculation represents a quantity measured by a student in the laboratory. P =  After performing the calculation,the student's calculator appeared as shown below:
To the correct number of significant figures what is the value of P? 
A)2 
B)2.43 
C)2.430 
D)2.430094

Quizplus · Accepted Answer

To determine the correct value of P with the correct number of significant figures, we need to look at the last value in the calculator display: TB4940_00. This value represents the uncertainty in the calculation, which is in this case 0.0001. 
Since P has five significant figures (including the uncertain digit), we need to round it to the nearest 0.0001. 
Looking at the calculator display, we see that the last four digits are 2618, which is closer to 0 than to 9999. Therefore, we round down the fourth decimal place to get P = 2.430. 
Choice C is the only option that matches this value.

Each of the Numbers in the Following Calculation Represents a Quantity