You wish to roll a 7 on and 8-sided die. What is the probability that the first 7 happens on the 3rd, 4th, or 5th try?
1 answer:
Answer:
0.15%
Step-by-step explanation:
The probability of rolling a 7 on a 8-sided die will always be:
We know that for the first two tries that there is 7/8 chance that the die will land on anything but a 7:
For the die to land on a 7 the 3rd, 4th and 5th try is:
The probability is therefore:
The probability that the die will land on a 7 not on the first and second try but on the 3rd, 4th and 5th try is 0.15%
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Answer:
a) Mean=0 and Standard deviation=1
b) The z-scores have no units of measurement
Step-by-step explanation:
When we convert all the pulse rates of women to z-scores using the formula;
the mean is 0 and the standard deviation is 1.
The reason is that, the resulting distribution of z-scores forms a normal distribution which has a mean of 0 and a standard deviation of 1.
b) The z-scores are standardize scores and has no units of measurement. They give us how many standard deviations below or above the mean of the corresponding values.