Kathy had $10 and gave half of it to her brother. She then gave a third of the remaining
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Answer:
see explanation
Step-by-step explanation:
Given
tan a = =
We require the hypotenuse h
Using Pythagoras' identity
h² = 9² + 40² = 81 + 1600 = 1681 ( take square root of both sides )
h = = 41 , thus
sin a = =
cos a = =
The standard deviation of the sample proportion is:
The z-score for 0.7 is:
Reference to a standard normal distribution table shows that the probability that at least 70% of the sample prefers coke to pepsi is 0.8944 or 89.44%.
The z-score for 0.7 is:
Reference to a standard normal distribution table shows that the probability that at least 70% of the sample prefers coke to pepsi is 0.8944 or 89.44%.