Step-by-step explanation:
yo digo que es eso la verdad no se
The probability of a student scoring 75% in class work is 0.64, and the probability of a student scoring 85% is 0.45.
2 answers:
Answer: The probability of a student scoring 75%, given that they have already scored 85% in class work is 1.
Step-by-step explanation: Given,
and
.
Also,
If the student already scored 85%, the it is sure that he/she will definitely score 75%. Hence, the statement that the probability of a student scoring 75% in a class work, given that they already scored 85% is 1 is a true statement.
So, the second statement is true.
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Chebyshev's theorem in statistics states that for many probability distributions, no more than 1/k² of measured values will be k standard deviations away from the mean.
Because the area under the probability distribution curve is equal to 1, Chebyshev's theorem means that the shaded area shown in the figure is equal to 1 - 1/k².
When k = 1.75, the shaded area is
1 - 1/1.75² = 0.7635 = 67.35%
Therefore the percent of the area within +/- 1.75 standard deviations from the mean is
67.35/2 = 33.7%, which is at least 33% of the observations.
Answer:
According to the Chebyshev theorem, at least 33% of the observations lie within +/- standard deviations from the mean.
Because the area under the probability distribution curve is equal to 1, Chebyshev's theorem means that the shaded area shown in the figure is equal to 1 - 1/k².
When k = 1.75, the shaded area is
1 - 1/1.75² = 0.7635 = 67.35%
Therefore the percent of the area within +/- 1.75 standard deviations from the mean is
67.35/2 = 33.7%, which is at least 33% of the observations.
Answer:
According to the Chebyshev theorem, at least 33% of the observations lie within +/- standard deviations from the mean.
Answer:
Step-by-step explanation:
Given
Required
Probability of selecting 2 orange marbles
The total number of marbles is:
The probability that the first selection is orange is:
Because it is a selection without replacement, the number of orange marbles and the total number of marbles would decrease by 1, respectively.
So, the probability that the selection is orange is:
The required probability is: