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#### Mathematics 3 ESO – Unit 13 STATISTICS page 115 – Activity 34

a) In Bombay there are 25.000 restaurants. We ask in 15 restaurants how many waiters work in the restaurant. The answers are: 3, 5, 3, 1, 2, 6, 3, 4, 1, 3, 2, 4, 5, 2, 4.

• I)  What is the population?
• II)  What is the sample?
• III)  What is the random variable?
• IV)  Make a frequency table.

b)  Give two examples of discrete qualitative random variables.

c)  Give two examples of continuous qualitative random variables.

b)  Give two examples of discrete qualitative random variables.

e)  Watch the video on “Mean Median & Mode Song” and answer:

• I)  How do we find the mean?
• II)  How do we find the median for an even number of items?
• III)  What is the mode if there isn’t a number that repeats most often?
1. f) We measure the time it takes an antibiotic to cure patients. We repeat the experiment with ten different types of bacteria. The results (in hours) are: 47, 83, 53, 56, 53, 55, 61, 59, 64, 54.
• I)  What is the mean?
• II)  What is the mode?
• III)  What is the median?
• IV)  What is the range?
• V)  What is the variance?
• VI)  What is the standard deviation?