Statistics & mathematics assignments

Statistics & Mathematics assignments

(C) Con

(C) 4

(A) 3

(B) The mode is 12

(C) 2

(C) Both (I) and (II)

(A) The median of A is less than the median of B

(D)

Question 1

Battery life (x)

No. of Batteries (f)

f * x

1

5

5

2

6

12

4

7

28

9

8

72

6

9

54

5

10

50

2

11

22

1

12

12

Mean = / n = 255 / 8 = 31.875 hours.

Median = Lm x c = 25

Mode = 8 hours

Using calculator we get 2.815 hours Standard deviation.

Question 2

Class interval

Class centre

Tally

Frequency

Cumulative frequency

27-31

29

IIII II

7

7

32-36

34

IIII

5

10

37-41

39

IIII IIII

9

20

42-46

44

IIII IIII

9

30

47-51

49

IIII IIII

10

40

Range = Max - min = 51 - 28 = 23 CDs

The modal class is 47 - 51

The median will lie in the class 37 - 41

The ...