Solve Probability on HP50g: 3 Defectives in 7 Batteries Lot

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To solve the probability of finding exactly 3 defective batteries in a sample of 7 from a lot of 80 batteries containing 13 defectives, the binomial distribution is applicable. The formula P(X=Y) with parameters (n, p, x) is essential, where n is the number of trials, p is the probability of success, and x is the number of successes. Understanding the binomial distribution allows for the calculation of probabilities based on the given parameters. The discussion emphasizes the importance of determining the correct strategy and formula before using the HP50g calculator for computations. Mastery of these concepts is crucial for accurate probability calculations.
silverbabe
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how do I use the 50g to solve this one ?

in a 80 battery lot there are 13 defectives; then, if it is taken a sample of 7 batteries. Which is the probability to find exactly 3 defectives batteries?
 
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You don't use a calculator to solve a problem. You use a calculator to do the calculations after you have determined a strategy. What do you know about the "binomial distribution"?
 
...a strategy ?
 
You can use calculators to evaluate formulas, some even have formulas built in, by YOU have to know which formula to use! Again, what do you know about the "binomial distribution"?
 
I only know this one P(X=Y) (n,p,x)
 
Good, do you know what that means?
 
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