Material Quality Control (Histogram) - Casio fx-7400G PLUS Booklet

Q-1 Material Quality Control (Histogram)
Measurement of the diameters of 100 round rods that were to have been shaved to a diam-
eter of 35 mm revealed variation ranging from 34.55 to 35.45. Measurements were divided
into a number of ranges, which revealed the frequency distribution table shown below.
This data was used to create a bar graph histogram showing the frequency of the measured
values, combined with a distribution curve based on the median of each division.
Rod Diameter Measured Values
Measured Value
1 34.6
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Division Number
1
Diameter Range [mm] 34.55~34.65
Median
34.60
Frequency
1
Frequency Distribution Table
Division Diameter
Numbers Range [mm]
1 34.55~34.65
2 34.65~34.75
3 34.75~34.85
4 34.85~34.95
5 34.95~35.05
6 35.05~35.15
7 35.15~35.25
8 35.25~35.35
9 35.35~35.45
Total
34.68 34.82 34.91
34.71 34.76 34.87
34.66 34.75 34.85
34.71 34.83 34.91
34.65 34.78 34.86
34.67 34.84 34.88
34.67 34.75 34.85
34.75 34.85
34.75 34.89
34.83 34.91
34.79 34.87
34.94
34.94
34.86
34.89
34.85
34.86
2 3
34.65~34.75 34.75~34.85 34.85~34.95
34.70 34.80 34.90
7 11
Median [mm] Frequency Count
34.60
34.70
34.80
34.90
35.00
35.10
35.20
35.30
35.40
JIKKYO SHUPPAN CO., LTD.: SHIN KIKAI KOSAKU 2
34.96 35.06
35.02 35.08
35.03 35.08
35.02 35.14
35.04 35.11
35.01 35.05
35 35.07
34.95 35.13
35 35.1
35.01 35.11
35.02 35.08
34.99 35.09
34.97 35.05
34.99 35.13
35.02 35.05
34.97 35.1
34.98 35.1
35.03 35.07
34.98 35.09
34.96 35.08
35.04
35
34.97
35.03
4 5 6
34.95~35.05 35.05~35.15
35.00 35.10
17 24 20
Frequency
1
7
11
17
24
20
12
6
2
100
– 55 –
35.22 35.32
35.18 35.32
35.21 35.34
35.2 35.28
35.15 35.34
35.18 35.25
35.15
35.19
35.21
35.19
35.2
35.17
7 8
35.15~35.25 35.25~35.35 35.35~35.45
35.20 35.30
12 6
Histogram
Frequency
Diameter [mm]
35.36
35.35
9
35.40
2 100