A foreman wants to use an chart to control the average length of the bolts manufactured.He has recently collected the six samples given below. Calculate the average range.
A).036
B).18
C).030
D).05

Question

A foreman wants to use an  chart to control the average length of the bolts manufactured.He has recently collected the six samples given below.  Calculate the average range.
A).036 
B).18 
C).030 
D).05

Quizplus · Accepted Answer

To calculate the average range, we first need to calculate the range for each sample. Range is the difference between the largest and smallest values in the sample.

Sample 1: 0.435 - 0.400 = 0.035
Sample 2: 0.440 - 0.390 = 0.050
Sample 3: 0.425 - 0.380 = 0.045
Sample 4: 0.430 - 0.385 = 0.045
Sample 5: 0.445 - 0.410 = 0.035
Sample 6: 0.450 - 0.410 = 0.040

Next, we calculate the average of these ranges:
(0.035 + 0.050 + 0.045 + 0.045 + 0.035 + 0.040)/6 = 0.036

Therefore, the answer is choice C) 0.030.

A Foreman Wants to Use an Chart to Control