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3 years ago

I need the answer to a parts I-iii and the answer to b

Mathematics

1 answer:

fomenos3 years ago

3 0

Answer:

i) Mean = 72

ii) Median = 72

iii) Mode = 72

69, 70, 71, 72, 72, 72, 73, 74, 75

Step-by-step explanation:

a. To find mean, median and mode

It is given that all the 9 students get 72 marks.

Therefore the data set be,

72, 72, 72, 72, 72, 72, 72, 72 72

i) mean = (sum of data)/(total number of data)

= (9 * 72)/9 = 9

ii) Median - Central data in the data set when arranging ascending or descending order

72, 72, 72, 72, 72, 72, 72, 72 72

Median = 72

iii) Mode - Most repeating data in the data set

Here mode = 72

b). To find a data set

69, 70, 71, 72, 72, 72, 73, 74, 75

Here Mean, mode and median are all 72

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Question options:

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Explanation:

Formula to calculate standard deviation = √p(1-p)/n

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n= sample size

From the question,

We are given p(population proportion of catfish in the river)= 0.47

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The 10% condition demands that a sample size be not less than 10% of the population

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10% of 250= 0.10×250=25 fish

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