Factor completely 5x^2 - 13x - 6.
2 answers:
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Answer:
Z-score = -1.285
Step-by-step explanation:
We are given the following information in the question:
Mean, μ = 17.6 seconds
Standard Deviation, σ = 2.1 seconds
Formula:
For x = 14.9, we have:
A z-score to be unusual if its z-score is less than -2.00 or greater than 2.00.
Thus, the z-score is not unusual as it lies in the range [-2.00, 2.00]
Answer:
Step-by-step explanation:
a. Given the mean is 28 and the standard deviation is 2.4
-Let X be the score of any random selection from the population.
-The probability that a randomly selected score is greater than 30.4:
Hence, the probability that the score is greater than 30.4 is 0.1587
b. The probability that a randomly selected score is less than 32.8 given mean =28 and the standard deviation is 2.4:
Hence, the probability that a random score is less than 32.8 is 0.9773
c. The probability that a random selection has a score of between 25.6 and 32.8.
-Given the mean=28 and sd=2.4, the probability is calculated as follows:
Hence, the probability that a random selection has a score between 25.6 and 32.8 is 0.8186