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# Practical 4 Question 1 Using the empirical rule, Mrs. G found that 95% of the population is aged between 14 and 42.1 Calculate the mean and the...

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Practical 4 Question 1 Using the empirical rule, Mrs. G found that 95% of the population is aged between 14 and 42. 1.1 Calculate the mean and the standard deviation 1.2 Find the boundaries that will cover 99.7% of the population. 1.3 Find the boundaries that will cover 68% of the population. 1.4 Find the percentage of the population aged between 21 and 42 1.5 Find the percentage of the population aged more than 42 1.6 Find the percentage of the population aged 7 and 21 1.7 Find the percentage of the population aged less than 14 1.8 If a random sample of 525 is taken, how many people will be aged between 35 and 42 1.9 If a random sample of 1000 is taken, how many people will be aged more than 49. Question 2 Die personeelafdeling van ‘n versekeringsmaatskappy het die kwalifikasie-profiel van hul 200 bestuurders ontleed. Die kwalifikasievlak is die hoogste kwalifikasie wat ‘n bestuurder behaal het. / The personnel department of an Insurance firm analysed the qualifications profile of their 200 managers. The qualification level is the highest qualification achieved by a manager. Kwalifikasievlak/ Qualification level Bestuursvlak/ Manager level Seksiehoof / Section Head Departementshoof / Department Head Afdelingshoof/ Division Head Totaal / Total Matriek/ Matric Diploma/ Diploma Graad/ Degree 30 20 10 30 20 20 20 40 10 Totaal / Total 2.1 Voltooi die gebeurlikheidstabel. / Complete the above contingency table.
2.2 Wat is die moontlikheid dat ‘n person wat ewekansig gekies is:/ What is the probability of a person selected at random: (i) net matriek het?/ having only matric? (ii) ‘n seksiehoof met ‘n graad is?/ being a section head and having a degree? (iii) ‘n afdelingshoof is?/ being a division head? (iv) matriek of ‘n graad of diploma het?/ having matric, or a diploma, or a degree? (v) ‘n afdelingshoof is of ‘n diploma het?/ being a division head or having a diploma? Question 3 In ‘n groep mense wat vakansie hou, word vasgestel dat:/ In a group of people on holiday it is established that there are: 10 mans jonger as 21 jaar is./ 10 males under the age of 21. 8 vrouens jonger as 21 jaar is./ 8 females under the age of 21. 6 mans tussen 21 en 30 jaar oud is./ 6 males aged between 21 and 30. 5 vrouens tussen 21 en 30 jaar oud is./ 5 females aged between 21 and 30. 7 mans ouer as 30 jaar is./ 7 males over the age of 30. Bereken die moontlikheid dat indien een persoon ewekansig uit die groep gekies word, die persoon:/ Calculate the probability that, if one person is selected at random from the group this person will be: 3.1 ‘n man van jonger as 30 jaar is./ a male under the age of 30. 3.2 ‘n vrou is./ a female. 3.3 ‘n vrou van ouer as 30 jaar is./ a female over the age of 30. 3.4 ‘n man van ouer as 21 jaar is./ a male over the age of 21. 3.5 ‘n persoon van jonger as 21 is./ a person not older than 21. 3.6 ‘n vrou is, of tussen 21 en 30 jaar oud is./ a female or between 21 and 30 years. 3.7 ‘n man of ‘n vrou is./ a male or a female. Question 4 Gegee die volgende: P ( A | B )= 0.25 ; P ( A )= 0.32 ; P ( B ) = 0.77 4.1 Bereken. / Calculate: P ( A B ) 4.2 Bereken. / Calculate: P ( A B )
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Practical 4
Question 1
Using the empirical rule, Mrs. G found that 95% of the population is aged between 14 and 42.
1.1
Let Calculate the mean and the standard deviation
μ∧σ are the mean and...

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