Introduction to Statistics-5th Hybrid Fall 2017 Homework: HW 7.1, 7.2 Score: 0 o

Question

Introduction to Statistics-5th Hybrid Fall 2017 Homework: HW 7.1, 7.2 Score: 0 of 1 pt 7.2.29 StatLab 24 of 29 (22 complete) HW Score: 62 64%, 79p: Course Home Question Help * e the random variable X is normally distributed with mean = 50 and standard deviation 7 Compute the pr obability Be sure to draw a normal curve with t area corresponding to the probability shaded P55X69) 9 Click the icon to view a table of areas under the normal curve Which of the following normal curves corresponds to P(55sXs69)? Student Acti Study Plan A. B. StatCrunch Chapter Contents e Text Tools for Success 50 69 50 55 69 50 55 69 click to seleci your answer and then click Check Answer 1 remaining emmi Discussions Course Tools 0 Type here to search DOLL

Explanation / Answer

Option B represents the correct graph. The middle value is the mean which is 50 and 55 should lie away from the mean to the right. The probability is between the values 55 and 69, therefore option B is the the right answer

Formula: Z = (X - mean)/std. dev.

P(55 <= X <= 69) = P(X <= 69) - P(X <= 55) = P(Z < (69 - 50)/7) - P(Z < (55 - 50)/7) = P(Z < 2.71) - P(Z < 0.71)
= 0.9966 - 0.7611 = 0.2355

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.