jessicer12p3aiox jessicer12p3aiox
  • 16-01-2019
  • Mathematics
contestada

What is the probability of selecting a z score between -0.85 and 1.15?
A. 0.8749
B . 2.0
C . 0.6772
D . 0.1977

Respuesta :

frika
frika frika
  • 16-01-2019

Answer:

Correct choice is C

Step-by-step explanation:

For the normal distribution ([tex]Z\sim N(0,1)[/tex]) the probability that a z score is between -0.85 and 1.15 is

[tex]Pr(-0.85<z<1.15)=Pr(z<1.15)-Pr(z<-0.85).[/tex]

According to the normal distribution table:

[tex]Pr(z<1.15)=0.8749,\\ \\Pr(z<-0.85)=1-Pr(z>0.85)=1-0.8023=0.1977,[/tex]

then

[tex]Pr(-0.85<z<1.15)=Pr(z<1.15)-Pr(z<-0.85)=0.8749-0.1977=0.6772.[/tex]

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