Question

According to a​ report,

64.764.7​%

of murders are committed with a firearm.​(a) If

300300

murders are randomly​ selected, how many would we expect to be committed with a​ firearm?​(b) Would it be unusual to observe

204204

murders by firearm in a random sample of

300300

​murders? Why?

​(a) We would expect

nothing

to be committed with a firearm.

​(b) Choose the correct answer below.

A.

YesYes​,

because

204204

is greater than mu plus 2 sigma .greater than μ+2σ.

B.

NoNo​,

because

204204

is between mu minus 2 sigma and mu plus 2 sigma .between μ−2σ and μ+2σ.

C.​Yes, because

204204

is between

mu minus 2 sigmaμ−2σ

and

mu plus 2 sigmaμ+2σ.

D.​No, because

204204

is greater than

mu plus 2 sigmaμ+2σ.

E.​No, because

204204

is less than

mu minus 2 sigmaμ−2σ

According to an​ almanac,

8080​%

of adult smokers started smoking before turning 18 years old.​(a) If

100100

adult smokers are randomly​ selected, how many would we expect to have started smoking before turning 18 years​ old?​(b) Would it be unusual to observe

8585

smokers who started smoking before turning 18 years old in a random sample of

100100

adult​ smokers? Why?

​(a) We would expect about

nothing

adult smokers to have started smoking before turning 18 years old.

​(Type a whole​ number.)

​(b) Would it be unusual to observe

8585

smokers who started smoking before turning 18 years old in a random sample of

100100

adult​ smokers?

A.

YesYes​,

because

8585

is greater than mu plus 2 sigma .greater than μ+2σ.

B.​Yes, because

8585

is between

mu minus 2 sigmaμ−2σ

and

mu plus 2 sigmaμ+2σ.

C.

NoNo​,

because

8585

is between mu minus 2 sigma and mu plus 2 sigma .between μ−2σ and μ+2σ.

D.

YesYes​,

because

8585

is between mu minus 2 sigma and mu plus 2 sigma .between μ−2σ and μ+2σ.

E.​No, because

8585

is less than

mu minus 2 sigmaμ−2σ.

Answer 1

We would expect to be committed with a firearm.

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We would expect about adult smokers to have started smoking before turning 18 years old.