# Question

The following probability model shows the distribution of the most-popular-selling Girl Scout Cookies.

Cookie Type ..................................................... Probability

Thin Mints ................. 0.25

Samoas®/Caramel deLites™ .......... 0.19

Peanut Butter Patties®/Tagalongs™ ....... 0.13

Peanut Butter Sandwich/Do-si-dos™ ....... 0.11

Shortbread/Trefoils ............. 0.09

Other varieties ................ 0.23

(a) Verify that this is a probability model.

(b) If a girl scout is selling cookies to people who randomly enter a shopping mall, what is the probability that the next box sold will be Peanut Butter Patties®/Tagalongs™ or Peanut Butter Sandwich/Do-si-dos™?

(c) If a girl scout is selling cookies to people who randomly enter a shopping mall, what is the probability that the next CHAPTER TEST box sold will be Thin Mints, Samoas®/Caramel deLites™, or Shortbread/Trefoils?

(d) What is the probability that the next box sold will not be Thin Mints?

Cookie Type ..................................................... Probability

Thin Mints ................. 0.25

Samoas®/Caramel deLites™ .......... 0.19

Peanut Butter Patties®/Tagalongs™ ....... 0.13

Peanut Butter Sandwich/Do-si-dos™ ....... 0.11

Shortbread/Trefoils ............. 0.09

Other varieties ................ 0.23

(a) Verify that this is a probability model.

(b) If a girl scout is selling cookies to people who randomly enter a shopping mall, what is the probability that the next box sold will be Peanut Butter Patties®/Tagalongs™ or Peanut Butter Sandwich/Do-si-dos™?

(c) If a girl scout is selling cookies to people who randomly enter a shopping mall, what is the probability that the next CHAPTER TEST box sold will be Thin Mints, Samoas®/Caramel deLites™, or Shortbread/Trefoils?

(d) What is the probability that the next box sold will not be Thin Mints?

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