## anonymous one year ago A health food store has launched a new pack of vitamins for children. The store records the number of packs ordered by a random sample of 100 online customers and the number of packs ordered by a random sample of 100 walk-in customers.

1. anonymous

2. anonymous

Which of the following inferences can be drawn about the buying pattern of the online customers versus that of the walk-in customers? Online customers buy an average of five packs compared with walk-in customers, who buy an average of three packs. Online customers buy an average of five packs compared with walk-in customers, who buy an average of two packs. Online customers buy an average of six packs compared with walk-in customers, who buy an average of three packs. Online customers buy an average of six packs compared with walk-in customers, who buy an average of two packs.

3. anonymous

@Michele_Laino @Vocaloid

4. welshfella

Count the total number of packs bought by on-line customers and the same for walk-in. You can then find the average number of packs per customer by dividing the above totals by the number of customers

5. anonymous

OK

6. welshfella

Number packs for on-line customers = 5*6 + 4*5 + 4 = ?

7. anonymous

54 @welshfella

8. anonymous

9. Michele_Laino

the mean of online customers is: $\Large \frac{{\left( {4 \cdot 1} \right) + \left( {5 \cdot 4} \right) + \left( {6 \cdot 5} \right)}}{{10}} = ...?$

10. welshfella

54 is right so divide that by 10 to get the mean for online customers

11. Michele_Laino

whereas the mean of walk-in customers is: $\Large \frac{{\left( {3 \cdot 2} \right) + \left( {3 \cdot 6} \right) + \left( {4 \cdot 1} \right)}}{{10}} = ...?$

12. anonymous

28?

13. Michele_Laino

yes! and 28/10=...?

14. anonymous

2.8

15. Michele_Laino

correct! which can be rounded off to 3

16. Michele_Laino

whereas the mean of online customers is 54/10=...?

17. anonymous

5.4

18. Michele_Laino

correct! and it can be rounded off to 5

19. Michele_Laino

so, what is the right option?

20. anonymous

A.

21. Michele_Laino

that's right!

22. anonymous

thank you so much! :)

23. Michele_Laino

:)