Q.4: Solve the following problem: 20 samples of manufactured pipe were inspected to measure the external diameter (in mm) of this product to nearest 1 mm. Use 8 classes starting with first class 130-135. The data are as follows:

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Q.4: Solve the following problem:
20 samples of manufactured pipe were inspected to measure the external diameter (in mm) of this product
to nearest 1 mm. Use 8 classes starting with first class 130-135. The data are as follows:
140 138 133 148 160
153 131 146
134
136
149 141 155 149 165
142 144 147
138 139
(a) Construct a complete frequency distribution table starting
with a class limit 40-44.
(b) Calculate: (i) Mean (ii) Variance (iii) Standard deviation
Transcribed Image Text:Q.4: Solve the following problem: 20 samples of manufactured pipe were inspected to measure the external diameter (in mm) of this product to nearest 1 mm. Use 8 classes starting with first class 130-135. The data are as follows: 140 138 133 148 160 153 131 146 134 136 149 141 155 149 165 142 144 147 138 139 (a) Construct a complete frequency distribution table starting with a class limit 40-44. (b) Calculate: (i) Mean (ii) Variance (iii) Standard deviation
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