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8. The following data represents the lifetime in hours of 20 bulbs produced by a factory :235, 236, 238, 232, 230, 239, 235, 236, 237, 231, 240, 239, 233, 232, 240, 231, 239, 238,233, 230Construct a frequency table for the given data. Use your table to answer the following questions:(i) How many bulbs had lifetime more than 235 hours?(11) How many bulbs had lifetime less than 234 hours ?(iii) What per cent of bulbs had lifetime more than 238 hours?(iv) The manufacturer claimed that 70% of the bulbs produced by his factory has a minimumlifetime of 236 hours. What per cent of the bulbs did not fulfil the claim? |
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