The target load weight for a ladder is 250 lb. A technician selects 5 ladders at random per day to test load limit and records the mean load for each day.Determine the most accurate mean control chart drawn from the data shown in the table.
Hour
Mean
1
260
2
238
3
275
4
238
5
258
6
260
Hour
Mean
7
250
8
270
9
261
10
265
11
241
12
248
Hour
Mean
13
273
14
265
15
260
16
253
17
240
18
245
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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