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lilyrockstarmag
03.09.2020 •
Mathematics
What is the image of the point (-7,-8)(−7,−8) after a rotation of 180 ∘ counterclockwise about the origin?
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Ответ:
After a rotation of 180° about the origin, the point (-8;7) become the point (8;-7)
Ответ:
Hence, Stacy will spin 6, 8.33 times out of her n = 50 attempts.
Step-by-step explanation:
Let us consider a success to get a 6. In this case, note that the probability of having a 6 in one spin is 1/6. We can consider the number of 6's in 50 spins to be a binomial random variable. Then, let X to be the number of trials we get a 6 out of 50 trials. Then, we have the following model.
We will estimate the number of times that she spins a 6 as the expected value of this random variable.
Recall that if we have X as a binomial random variable of n trials with a probability of success of p, then it's expected value is np.
Then , in this case, with n=50 and p=1/6 we expect to have number of times of having a 6, which is 8.33.