gbprulesmile
24.10.2019 •
Mathematics
Students in a large college class took an exam and did poorly. the mean of the scores for the class was 51 (out of 100), and the standard deviation was 12. the professor felt that the test may have been too difficult and decided to adjust the scores. she multiplied each test score by 1.5 and then added 5 to get the adjusted score. in other words, to obtain the adjusted score y from the original score x, she used the transformation =y+1.5x5. what is the mean of the adjusted test scores? do not round your response. 2. what is the standard deviation of the adjusted test scores? do not round your response. x 6 ?
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Ответ:
1/7
Step-by-step explanation:
There are 8 sample points in the sample space. The sample space is
S = {HHH, HHT, HTH, THH, TTH, THT, HTT, TTT}. The event at least one coin is head is compoused
by seven sample points: {HHH, HHT, HTH, THH, TTH, THT, HTT}, then, to obtain the probability of three heads given that we know that at least one coin is head, we should regard the "new sample space" reduced, i.e., we should consider the set with seven sample points as the new sample space. In the new sample space, just one point corresponds to three heads. Therefore the probability we are seeking is 1 out of 7 or 1/7.