sagereagin

05.12.2019 • 

Mathematics

In a national survey college students were asked "how often do you wear a seatbelt when riding in a car driven by someone else? " the response frequencies are as follows: never is 122 ; rarely is 322 ; sometimes is 597 ; most of the time is 1157 ; always is 2309. a) construct a probability model for seat-belt use by a passenger. b) would it be considered unusual to find a college student who never wears a seat belt when riding in a car driven by someone else?

Ответ:

jazzy1926

29.12.2022

Mathematics

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The word "of" tells us we need to multiply.

So 3/5 of 15 means the same thing as (3/5) · (15).

Think of the 15 as 15/1 so when multiplying,

we can cross-cancel the 5 and 15 to 1 and 3.

So we have (3/1) · (3/1) which is 9/1 or just 9.

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