Math Problem Statement

Suppose Z follows the standard normal distribution. Determine the value of c such that P(1.18 ≤ Z ≤ c) = 0.0798.

Solution

The problem involves finding the value of cc such that the probability of ZZ, a standard normal variable, falling between 1.18 and cc is 0.0798. We are tasked with solving this:

P(1.18Zc)=0.0798P(1.18 \leq Z \leq c) = 0.0798

Steps to Solve:

  1. Convert probabilities to Z-scores using the standard normal table:

    • The probability corresponding to P(Zc)P(Z \leq c) can be split as: P(1.18Zc)=P(Zc)P(Z1.18)P(1.18 \leq Z \leq c) = P(Z \leq c) - P(Z \leq 1.18)
    • From the standard normal table, find the cumulative probability P(Z1.18)P(Z \leq 1.18).
  2. Solve for P(Zc)P(Z \leq c):

    • Using the known values, determine P(Zc)P(Z \leq c).
    • Use the cumulative probability table or a calculator to find the Z-score cc.

I will now proceed to calculate the value of cc.The value of cc that satisfies the equation P(1.18Zc)=0.0798P(1.18 \leq Z \leq c) = 0.0798 is approximately c=1.76c = 1.76 when rounded to two decimal places.

Would you like any further details on the steps?

Here are 5 related questions to deepen your understanding:

  1. What is the meaning of the standard normal distribution in probability?
  2. How do you interpret cumulative probabilities for a Z-score?
  3. Can you explain why we subtract probabilities in this case?
  4. What are other methods to calculate probabilities in the standard normal distribution?
  5. How would the answer change if the given probability P(1.18Zc)P(1.18 \leq Z \leq c) was different?

Tip: The cumulative distribution function (CDF) for the standard normal distribution helps find the area under the curve to the left of a given Z-score.

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Math Problem Analysis

Mathematical Concepts

Probability
Standard Normal Distribution

Formulas

P(a ≤ Z ≤ b) = P(Z ≤ b) - P(Z ≤ a)
Standard Normal CDF (Cumulative Distribution Function)

Theorems

Properties of the Standard Normal Distribution

Suitable Grade Level

College-Level Statistics or Advanced High School