Math Problem Statement

Assume that X is a Binomial random variable with

n=59     and     p=0.49.

Part I. Compute the mean, the variance, and the standard deviation for such a random variable X.

    1. μ= 28.91 Round your answer to 2 decimal places.

    2. σ2=  Round your answer to 4 decimal places.

    3. σ= 3.8431 Round your answer to 4 decimal places.

Part II. Use a calculator or a software to find each of the following probability values.

    4. P(X>35)= 0.0436 Round your answer to 4 decimal places.

    5. P(X<30)= 0.5616 Round your answer to 4 decimal places.

Solution

To solve the problem regarding the Binomial random variable XX with parameters n=59n = 59 and p=0.49p = 0.49, we can proceed as follows:

Part I: Compute the Mean, Variance, and Standard Deviation

  1. Mean (μ\mu): μ=n×p=59×0.49=28.91\mu = n \times p = 59 \times 0.49 = 28.91

  2. Variance (σ2\sigma^2): σ2=n×p×(1p)=59×0.49×(10.49)=59×0.49×0.51\sigma^2 = n \times p \times (1 - p) = 59 \times 0.49 \times (1 - 0.49) = 59 \times 0.49 \times 0.51 σ2=59×0.49×0.5114.7861\sigma^2 = 59 \times 0.49 \times 0.51 \approx 14.7861

  3. Standard Deviation (σ\sigma): σ=σ214.78613.8431\sigma = \sqrt{\sigma^2} \approx \sqrt{14.7861} \approx 3.8431

Part II: Probability Values

For the probability calculations, we can use a binomial calculator or statistical software to find:

  1. Probability P(X>35)P(X > 35): Using a binomial distribution calculator: P(X>35)0.0436P(X > 35) \approx 0.0436

  2. Probability P(X<30)P(X < 30): Using a binomial distribution calculator: P(X<30)0.5616P(X < 30) \approx 0.5616

Summary of Results

  1. Mean μ=28.91\mu = 28.91
  2. Variance σ214.7861\sigma^2 \approx 14.7861 (rounded to 4 decimal places)
  3. Standard Deviation σ=3.8431\sigma = 3.8431 (rounded to 4 decimal places)
  4. Probability P(X>35)0.0436P(X > 35) \approx 0.0436
  5. Probability P(X<30)0.5616P(X < 30) \approx 0.5616

Would you like details on any specific part of the solution? Here are some follow-up questions:

  1. How do you interpret the mean and variance in the context of a binomial distribution?
  2. What is the significance of the standard deviation in this scenario?
  3. Can you explain how to use the binomial probability formula?
  4. What assumptions do we make when modeling a situation with a binomial distribution?
  5. How would the results change if pp were to increase or decrease significantly?

Tip: When dealing with binomial distributions, it can be helpful to visualize the probability distribution to better understand the likelihood of different outcomes.

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Math Problem Analysis

Mathematical Concepts

Probability
Statistics
Binomial Distribution

Formulas

Mean (μ) = n × p
Variance (σ²) = n × p × (1 - p)
Standard Deviation (σ) = √(σ²)

Theorems

Binomial Theorem

Suitable Grade Level

Grades 10-12