Answer:
Step-by-step explanation:
How many questions is 90% of 20? That's the question we need to answer. Algebraically, the equation looks like this:
x = .90(20) so
x = 18
If she only answered 16 correctly, she did not get the A. She needed to answer 18 correctly, because 18 is 90% of 20.
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Step-by-step explanation:
Answer:
$521.58 < μ < $666.1
Step-by-step explanation:
Spring break can be a very expensive holiday. A sample of 80 students is surveyed, and the average amount spent by students on travel and beverages is $593.84 at 92% confidence level. The sample standard deviation is approximately $369.34. Is $521.58 ≤μ≤ $666.10 correct?
Given that:
number of samples (n) = 80 students, mean (μ) = $593.84, standard deviation (σ) = $369.34, confidence level (c) = 92% = 0.92.
α = 1 - c = 1 - 0.92 = 0.08
the z score of 0.46 (0.5 - 0.04) is the same as the z score of 0.04. This is gotten from the Normal Distribution Table.
Therefore,
The margin of error (e) is given as:
The confidence interval = (μ - e, μ + e) = ($593.84 - $72.26, $593.84 + $72.26) = ($521.58, $666.1)
The confidence interval is $521.58 < μ < $666.1
The lowest common multiple of 2 and 3 is 6
The probability of throwing a multiple of 3 will be or 0.5.
<h3>What is probability?</h3>
Probability is defined as the ratio of the number of favourable outcomes to the total number of outcomes in other words the probability is the number that shows the happening of the event.
The probability of getting multiple 3 on the side of the six faces die will be calculated as:-
Total outcomes = { 1,2,3,4,5,6} = 6
favourable outcomes = { 2,4,6} = 3
Probability = favourable outcomes ÷ Total outcomes
= 3 ÷ 6
= 1 ÷ 2
= 0.5
Therefore the probability of throwing a multiple of 3 will be or 0.5.
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