S2-L25 Statistics Practice : Average

(Part 1) TEACHING(10-15mins)                

1.  Relationship between average, total value of data, word problems

(Part2) PRACTICE (20-35mins)
Find the average of:

1.   38, 41 and 44

2.   $130, $125, $108

3.   38kg, 37kg, 44kg, 41kg

4. The table shows the amount of money John saved from January to April.

What was the amount of money John saved in May if the average amount of money he saved from January to May is $32? (15/p1/18f)

(1) $25     

(2) $32     

(3) $64     

(4) $160                                                                                       (                       )

5.  The weight of Parcel A is 6 kg. Parcel B is as heavy as Parcel A. Parcel C is twice as heavy as Parcel B. What is the average mass of the 3 parcels?

6.  The average cost of 3 magazine is 8$. The total cost of 2 of the magazine is $6.8. What is the cost of the third card?

7.  The average mass of 5 boxes is 225g. What is the total mass of the 5 boxes?

8.   Remy spent an average of $3 per day from Monday to Friday. He spent an average of $5 per day for Saturday and Sunday. How much did he spend in one week? (23/p1/s18)

9.The average number of mangoes in 5 baskets was 53. Whenanother basket of mangoes was added, the average number of mangoes became 49. How many mangoes were there in the last basket? (/183/p2/s)

Extra Practice

1. *  The average of 9 numbers is 140. One of the numbers is 180. What is the average of the other 8 numbers?

2.  Amy scored an average of 80 marks for 3 tests. She scored 82 and 75 mars for the first two tests. What was her score for the third test?

3.*  Calvin bought some goldfish at $10 each. He also bought an equal number of angelfish at a different price. The average price of a goldfish and an anglefish was $7.

Calvin paid $54 more for the goldfish than the anglefish. How may goldfish did he buy?

4.  The pass of Parcel A is 6 kg. Parcel B is as heavy as Parcel A. Parcel C is twice as heavy as Parcel B. What is the average mass of the 3 parcels?

Answer Keys

1.            41

2.            121

3.            40 kg

4.            1

5.            8 kg

6.            $10.40

7.            1125 kg

8.            $25

9.            29