Math Problem Statement

Consider the following data:

x 4 5 6 7 8 P(X=x) 0.1 0.1 0.2 0.2 0.4

Step 5 of 5 : Find the value of P(X>7) . Round your answer to one decimal place.

Solution

We are tasked with finding P(X>7)P(X > 7), which is the probability that XX takes on a value greater than 7. From the given dataWe are tasked with finding P(X>7)P(X > 7), which is the probability that XX takes on a value greater than 7. From the given

x={4,5,6,7,8}x = \{4, 5, 6, 7, 8\} P(X=x)={0.1,0.1,0.2,0.2,0.4}P(X = x) = \{0.1, 0.1, 0.2, 0.2, 0.4\}

We need to sum the probabilities for all values of XX greater than 7, which in this case is only X=8X = 8.

P(X>7)=P(X=8)=0.4P(X > 7) = P(X = 8) = 0.4

Thus, the value of P(X>7)P(X > 7) is 0.4.

Do you need more details on probability distributions or have any questions?

Here are five related questions to expand on this topic:

  1. How do you find the probability of P(X<6)P(X < 6)?
  2. What is the sum of all probabilities for P(X=x)P(X = x)?
  3. How can you verify that the probability distribution is valid?
  4. What is the expected value of XX for the given data?
  5. How would you calculate the variance of this probability distribution?

Tip: The sum of probabilities in any probability distribution must always equal 1.

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Math Problem Analysis

Mathematical Concepts

Probability
Discrete Probability Distributions

Formulas

P(X > 7) = P(X = 8)
Sum of probabilities: ∑P(X=x) = 1

Theorems

Probability Distribution Theorem

Suitable Grade Level

Grades 9-12