It has been determined that in Costa Rica 20% of families are lower class; Meanwhile, the percentage of middle and upper class families must be determined. Of upper class families, 90% usually leave the country by the end of the year, 30% of middle class families and 5% of lower class families do the same. The probability that a randomly chosen middle-class family who happened to leave the country at the end of last year was 0.4. Determine the percentage of upper class families in Costa Rica

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general 11 months ago 2423

In an advertising company, a survey was carried out on 30 employees about the usefulness of electronic devices in their day-to-day life and in their work environment. The objective of the survey was to identify whether the prohibition or restriction of cell phones during the working day improved productivity. The results of the survey are shown below: Per day, how much time (in hours) do you spend in front of the cell phone screen? 2 0.8 1.2 2.2 3 5.2 1.5 1 1 2 4.7 4.3 4 2.3 3.8 4.2 4 4.9 3.8 2 3.5 1.5 2.5 3.2 4.3 4 3.9 3 3.5 3.6

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solved
general 11 months ago 2577