The following are the durations in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier.TABLE 1RelativeTime (in Minutes)                   Frequency       0 but less than 5                     0.375 but less than 10                   0.2210 but less than 15                 0.1515 but less than 20                 0.1020 but less than 25                 0.0725 but less than 30                 0.0730 or more                              0.0Referring to Table 1, what is the width of each class? A. 100 minutes B. 1 minute C. 5 minutes D. 2.5 minutes

Question 7A statistical analysis of 2,000 long-distance telephone calls made from the headquarters of theBricks and Clicks Computer Corporation indicates that the length of these calls is normallydistributed, with 𝜇 = 300 seconds and 𝜎 = 50 seconds. (4 marks)(a) What is the probability that a call lasted less than 210 seconds?(b) What is the probability that a call lasted between 210 and 320 seconds?(c) What is the probability that a call lasted between 100 and 210 seconds?(d) 10% of all calls will last less than how many seconds?

Below is the table showing the number of working hours (per week) of 400 students:Number of Hours Frequency  0 -   9  2010 - 19  8020 - 2920030 - 39100What is the class width for this distribution?Group of answer choices10939varies from class to class

The following data show the number of hours worked by 200 statistics students.Number of Hours Frequency0 - 9                4010 - 19            5020 – 29            7030 - 39           40The class width for this distribution is ______Select one:a.9b.10c.40d.0

The length of time for long-distance phone calls has been found to be normally distributed, with a mean of 20.8 minutes and a standard deviation of 6.7 minutes. In a randomly selected sample of 68 calls, what is the sample average call time below which 10% of sample average call times will be shorter? (2 decimal places)

Consider the following frequency table representing the distribution of hours students study for an exam in a week.Hours Students Study for an Exam in a WeekClass Frequency8–158–158816–2316–234424–3124–31141432–3932–394440–4740–471010Copy DataStep 1 of 2 :  Determine the relative frequency for the third class as a simplified fraction.