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QUESTION 1

The frequency table below shows the percentages obtained in a Biometry test for a random sample of 60 students:


Interval fi xi F
[30 – 40) 5 b1 c1
[40 – 50) 12 b2 c2
[50 – 60) 18 b3 c3
[60 – 70) 15 b4 c4
[70 – a1) 7 b5 c5
[a1 – 90) 2 b6 c6
[90 – 100) 1 b7 c7


For the percentages obtained, find the range.

70


60


80


100




1 points

QUESTION 2

The frequency table below shows the percentages obtained in a Biometry test for a random sample of 60 students:


Interval fi xi F
[30 – 40) 5 b1 c1
[40 – 50) 12 b2 c2
[50 – 60) 18 b3 c3
[60 – 70) 15 b4 c4
[70 – a1) 7 b5 c5
[a1 – 90) 2 b6 c6
[90 – 100) 1 b7 c7


For the percentages obtained, find the persentile.

78


66.72


75.72


54

1 points

QUESTION 3

Given the following data
25 26 21 19 30 32 25 24 23
Calculate the
sample variance.


14.7


16.5


15.4


13.2

1 points

QUESTION 4

The frequency table below shows the percentages obtained in a Biometry test for a random sample of 60 students:


Interval fi xi F
[30 – 40) 5 b1 c1
[40 – 50) 12 b2 c2
[50 – 60) 18 b3 c3
[60 – 70) 15 b4 c4
[70 – a1) 7 b5 c5
[a1 – 90) 2 b6 c6
[90 – 100) 1 b7 c7


For the percentages obtained, find the sample standard deviation.

11.39


16.89


15.69


13.29