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yulyashka [42]
3 years ago
10

Prepare a Pareto chart of the possible causes for a student to fail a final examination in a university course.

Business
1 answer:
Hitman42 [59]3 years ago
5 0

Answer:

Option 1

\bar x_1 = 96.2

Mode = 99

\sigma_1 = 3.22

Option 2

\bar x_2 = 97.4

Mode = 97

\sigma_2 = 0.499

Explanation:

Given

Option\ 1: 99, 98, 99, 94, 92, 99, 98, 99, 94, 90

Option\ 2: 98, 97, 97, 97, 98, 98, 97, 97, 98

Required

The mean, mode and standard deviation of both options

Option 1

<u>Calculate mean</u>

\bar x = \frac{\sum x}{n}

\bar x_1 = \frac{99+ 98+ 99+ 94+ 92+ 99+ 98+ 99+ 94+ 90}{10}

\bar x_1 = \frac{962}{10}

\bar x_1 = 96.2

<u>Calculate mode</u>

Mode = 99

Because it has a frequency of 4 (more than other element of the dataset)

<u>Calculate standard deviation</u>

\sigma = \sqrt{\frac{\sum(x - \bar x)^2}{n}}

\sigma_1 = \sqrt{\frac{(99-96.2)^2 +.............+(90-96.2)^2}{10}}

\sigma_1 = \sqrt{\frac{103.6}{10}}

\sigma_1 = \sqrt{10.36}

\sigma_1 = 3.22

Option 2

<u>Calculate mean</u>

\bar x = \frac{\sum x}{n}

\bar x_2 = \frac{98+ 97+ 97+ 97+ 98+ 98+ 97+ 97+ 98}{9}

\bar x_2 = \frac{877}{9}

\bar x_2 = 97.4

<u>Calculate mode</u>

Mode = 97

Because it has a frequency of 5 (more than other element of the dataset)

<u>Calculate standard deviation</u>

\sigma_2 = \sqrt{\frac{(98-97.4)^2+..............+ (98-97.4)^2}{9}}

\sigma_2 = \sqrt{\frac{2.24}{9}}

\sigma_2 = \sqrt{0.2489}

\sigma_2 = 0.499

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