# Probability

posted by .

70% of all burger chain stores decided to advertise in their local newspaper. Of those chain stores that advertised in thier local newspapers, 60% had an increase in sales. Of those chain stores that did not advertise, 25% had an increase in sales. What is the probability that a randomly selected store with an increase in sales advertised in its local newspaper?

is 28/33 correct?

0.7000 advertised in local newspapers.
0.4200 (60%) advertised and had increased sales
0.2800 advertised and did not have incresed sales
0.3000 did not advertise
0.2250 did not advertise and had no increase
0.0750 did not advertise and had an increase in sales.
The fraction that had an increase in sales was 0.075 + 0.4200 = 0.495. The fraction that had advertised was 0.42. All fractions refer to the total population.
I also get answer to be 420/495 = 28/33

## Respond to this Question

 First Name School Subject Your Answer

## Similar Questions

1. ### history

During the 1890s local storekeepers protested rural free delivery by the Post Office becaue they feared competition from mail-order businesses that offered a greater variety of goods at lower prices. Describe the challenges faced by …
2. ### stats

TABLE 1 The general manager of a chain of pharmaceutical stores reported the results of a regression analysis, designed to predict the annual sales for all the stores in the chain (Y) – measured in millions of dollars. One independent …
3. ### Math

in the local mall there are twice as many clothing stores as there are music stores. there are twice as mny music stores as there are computer stores. if there are 16 clothing stores, how many computer stores are in the mall?
4. ### Statistics

The per-store daily customer count (i.e., the mean number of customers in a store in one day) for a nationwide convenience store chain that operates nearly 10,000 stores has been steady, at 900, for some time. To increase the customer …
5. ### math

A health inspector wants to check compliance with a new city ordinance on meat storage. Since he can only inspect 10 of the 33 stores, he chooses to do a stratified random sample that consists of all 3 of the large chain stores, 4 …
6. ### algebra

A health inspector wants to check compliance with a new city ordinance on meat storage. Since he can only inspect 10 of the 33 stores, he chooses to do a stratified random sample that consists of all 3 of the large chain stores, 4 …
7. ### algebra

A health inspector wants to check compliance with a new city ordinance on meat storage. Since he can only inspect 10 of the 33 stores, he chooses to do a stratified random sample that consists of all 3 of the large chain stores, 4 …
8. ### Math

A health inspector wants to check compliance with a new city ordinance on meat storage. Since he can only inspect 10 of the 33 stores, he chooses to do a stratified random sample that consists of all 3 of the large chain stores, 4 …
9. ### Math

A health inspector wants to check compliance with a new city ordinance on meat storage. Since he can only inspect 10 of the 33 stores, he chooses to do a stratified random sample that consists of all 3 of the large chain stores, 4 …
10. ### math

A health inspector wants to check compliance with a new city ordinance on meat storage. Since he can only inspect 10 of the 33 stores, he chooses to do a stratified random sample that consists of all 3 of the large chain stores, 4 …

More Similar Questions