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प्रश्न
Choose the correct alternative:
A statistical analysis of long-distance telephone calls indicates that the length of these calls is normally distributed with a mean of 240 seconds and a standard deviation of 40 seconds. What proportion of calls lasts less than 180 seconds?
विकल्प
0.214
0.214
0933
0.067
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उत्तर
0.067
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संबंधित प्रश्न
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