Probobilty?

Question

Q # 1: MARKS 10

The following table shows the number of bags (hundreds) of fertilizer sold by certain dealer in different years.

Year Quarters

I II III Iv

2005

2006

2007

72 98 79 106

79 122 101 143

94 141 128 160

(i) Compute “4-quarter moving” averages.

(ii) Compute “4-quarter centred moving” averages

Q # 2: MARKS 04

A die is thrown. Fine the probability that the dots on the top are even numbers or odd numbers. Marks 4

Q # 3: MARKS 06

Find the probability that in a family of 4 children will be

(a) al least 1 boy

(b) At least 1 boy and 1 girl. Assume that the proba

Answer 1

I don't understand the "moving" and "centred moving" averages of Q#1.

Q#2 is 50%odd or even.  1,3,5 are odd and 2,4,6 are even.  That makes 3/6 and 3/6 or 50% and 50%.

Q#3

There are 5 possible combinations of boys and girls:

1) all boys.

2) 3 boys 1 girl.

3) 2 boys 2 girls.

4) 1 boy 3 girls.

5) all girls.

a) at least 1 boy - 4/5 or 80%

b) at least 1 boy and 1 girl - 3/5 or 60%

Hope that helped.

Answer 2

Question 1:

Years     Values    4-Q.M.Av    4-Q.Centred M.Av.

2005-1 72  

2 98 88  

3 76 89.75 88.875

4 106 95.75 92.75

2006-1 79 102 98.875

2 122 111.25 106.625

3 101 115 113.125

4 143 119.75 117.375

2007-1 94 126.5 123.125

2 141 130.75 128.625

3 128 107.25  

4 160