Question

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.

Answer 1

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.

Answer 2

@Michele_Laino @Vocaloid

Answer 3

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

Answer 4

OK

Answer 5

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

Answer 6

54 @welshfella

Answer 7

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

Answer 8

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

Answer 9

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

Answer 10

28?

Answer 11

yes! and 28/10=...?

Answer 12

2.8

Answer 13

correct! which can be rounded off to 3

Answer 14

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

Answer 15

5.4

Answer 16

correct! and it can be rounded off to 5

Answer 17

so, what is the right option?

Answer 18

A.

Answer 19

that's right!

Answer 20

thank you so much! :)

Answer 21

:)