Stats Ch 2 Notation

Which formula would you use to solve this problem? The probability of a resident having a home or cell phone

• P(A ∪ B) = P(A) + P(B) - P(A ∩ B)

• P(A ∩ B) = P(A) × P(B)

• P(A ∩ B) = P(A) × P(B|A)

Which formula would you use to solve this problem? Suppose 60​% of kids who visit a doctor have a​ fever, and 35​% of kids with a fever have sore throats.​ What's the probability that a kid who goes to the doctor has a fever and a sore​ throat?

• P(A ∪ B) = P(A) + P(B) - P(A ∩ B)

• P(A ∩ B) = P(A) × P(B)

• P(A ∩ B) = P(A) × P(B|A)

Find the area of the shaded region if the z-score is 1.25

• 0.1056

• 0.8944

• 0.8849

• 0.1151

Find the area of the shaded region if the z-score is 0.75

• 0.2266

• 0.7734

• 0.758

• 0.242

The random variable x is normally distributed with mean μ=174 and standard deviation σ=20. What is the z score if x=170?

• -0.2

• 0.2

• 2.8

• 3.4

The random variable x is normally distributed with mean μ=174 and standard deviation σ=20. What is P(x<170)?

• 0.2493

• 0.4207

• 0.5238

• 0.5938

The random variable x is normally distributed with mean μ=174 and standard deviation σ=20. What is the z score if x=200?

• -2.39

• -1.40

• 1.30

• 2.34

The random variable x is normally distributed with mean μ=174 and standard deviation σ=20. What is P(x<200)?

• 0.1024

• 0.3521

• 0.6433

• 0.9032

The random variable x is normally distributed with mean μ=174 and standard deviation σ=20. What is P(172<x<192)

• 0.1231

• 0.3557

• 0.6768

• 0.9132

Find P (z < 1.4 or z > 3.04).

• 0.0047

• 0.9204

• 0.8956

• 0.4981