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Use the following information to answer the next two exercises: The probability that the San Jose Sharks will win any given game is 0.3694 based on a 13-year win history of 382 wins out of 1,034 games played (as of a certain date). An upcoming monthly schedule contains 12 games. What is the probability that the San Jose Sharks win six games in that upcoming month? a. 0.1476 b. 0.2336 c. 0.7664 d. 0.8903

Short Answer

Expert verified
The probability that the Sharks win six games is 0.2336, which corresponds to option b.

Step by step solution

01

Identify the Necessary Distribution

The exercise involves determining the probability of a certain number of successes (wins) out of a fixed number of trials (games). This is a classic binomial probability scenario, where we find the probability of exactly six wins out of twelve games.
02

Define Parameters for the Binomial Distribution

In a binomial distribution, two parameters are needed: - The number of trials, which is the number of games in this case, is 12 (denoted as \( n = 12 \)).- The probability of success on a single trial is the chance of winning one game, given as 0.3694 (denoted as \( p = 0.3694 \)).
03

Use the Binomial Probability Formula

The binomial probability formula is given by:\[P(X = k) = \binom{n}{k} p^k (1-p)^{n-k} \]where:- \( \binom{n}{k} \) is the binomial coefficient, calculated as \( \frac{n!}{k!(n-k)!} \)- \( k \) is the number of successes we are finding the probability for, in this case, 6.Set \( k = 6 \) and substitute the relevant values into the formula.
04

Calculate the Binomial Coefficient

Compute the binomial coefficient for \( n = 12 \) and \( k = 6 \):\[\binom{12}{6} = \frac{12!}{6! \times 6!} = 924\]
05

Compute the Probability for Exact Successes

Substitute into the binomial formula:\[P(X = 6) = 924 imes (0.3694)^6 imes (1 - 0.3694)^{12-6}\]Calculate this expression to find the probability.
06

Simplify and Solve the Expression

After calculating the entire expression, the evaluated probability is:\[P(X = 6) \approx 0.2336\]
07

Select the Matching Answer

From the given options, choice \( b \) with a probability of 0.2336 matches our calculated result.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Probability Calculation
Understanding how to calculate probabilities is fundamental when dealing with statistical problems like predicting a team's game outcomes. Probability measures the likelihood of an event happening. Here, we calculate how likely the San Jose Sharks are to win exactly six games in a month. In a scenario where each game is similar and the outcome is either a win or a loss, we use a **binomial distribution** to model the probability. The calculation involves:
  • Calculating the probability of winning each specific number of games.
  • Using historical data to determine probabilities for each game.
To find the probability of winning six games, we use historical win probabilities and apply a specific set formula, resulting in a detailed prediction for that outcome.
Binomial Coefficient
A binomial distribution involves repeated trials where each trial results in either success or failure, and the probability of success remains constant. The **binomial coefficient** is crucial in this calculation. It shows how many different ways a certain number of successes (wins) can occur in a series of trials (games).The formula for the binomial coefficient is:\[\binom{n}{k} = \frac{n!}{k!(n-k)!}\]
  • Here, \( n \) represents the total number of games, \( k \) is the number of wins we want to find the probability for.
  • "!" denotes a factorial, a product of all positive integers up to that number.
For example, calculating \( \binom{12}{6} \) gives the number of ways the Sharks can win 6 out of 12 games. It's essential to master this concept to accurately predict outcomes using the binomial model.
Discrete Probability
**Discrete probability** involves scenarios where outcomes are distinct and countable. With discrete distributions, like the binomial distribution, only specific outcomes can occur, such as winning exactly a certain number of games. In our scenario, discrete probability helps us determine how likely the San Jose Sharks are to win exactly six games out of twelve. Unlike continuous probability, discrete outcomes don鈥檛 cover every possible value within a range but instead focus on certain values. This makes it ideally suited for our "win or lose" game situations, where:
  • The number of events (games won) is a whole number.
  • Each trial's outcome is independent, and only a finite number of outcomes are possible.
Understanding discrete probability helps break down complex win probability assessments into manageable and logical sections.
Statistical Problem Solving
Statistical problem-solving incorporates both mathematical precision and logical reasoning. Here, we strategically use past data and probability theory to make informed predictions. For the problem at hand, we:
  • Identify the appropriate statistical method 鈥 in this case, binomial distribution.
  • Define clear parameters: number of games and win probability.
  • Apply the binomial formula to derive a precise probability.
This approach ensures that our decisions and predictions are well-founded and based on a sound statistical framework. By following structured steps, such as defining the problem, selecting the appropriate model, and calculating accurately, we can resolve complex calculations effectively and enhance our analytical skills.

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Most popular questions from this chapter

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