Answer:
a) The expected number of smokers in a random sample of 140 students from this university is 16.8 smokers.
b) No, it is unlikely that smoking habits and waking up early to go to the gym on Saturday are independent.
Step-by-step explanation:
To calculate the expected numbers of smokers in a sample with size n=140 and proportion p=12%, we use the expected value of the binomial distribution:
The expected number of smokers in a random sample of 140 students from this university is 16.8 smokers.
If we take a sample at the opening of the gym, the sample is not expected to be representative of the population of the students. Most of the students that go to the gym usually have healthy habits, so the proportions of smokers is expected to be lower than the average of the university population.
I'm assuming you're looking to find the expanded form of the number?
This number is in scientific notation. The easiest way to convert it to a normal number is to move the decimal place 14 to the right. I've attached a picture showing how to do this. You should get 630,000,000,000,000
There's a faster way to do this - notice that you need to move the decimal 14 to the right, and there's one number already after the decimal place. Therefore, 13 places will be filled with zeros. So, just write out 63 and add 13 zeros.
For more general help on scientific notation, check out these videos: https://www.khanacademy.org/math/pre-algebra/pre-algebra-exponents-radicals/pre-algebra-scientific-notation/v/scientific-notation-old
Hope that helps! Feel free to message me or leave a comment if I can clarify anything :)
Answer:
$12
Step-by-step explanation:
Assuming you meant $6 per 1/2 hour
since by multiplying 1/2 by 2 we get 1 ( our unit rate) 6*2 = 12
whole number
12
fraction
12/1
Brainliest would be appreciated if this is helpful. Let me know if you have more questions
Hope this helps!
Answer
2 or 3
Step-by-step explanation:
Ali has 13 CD's
Here's how I got my answer:
Step 1: Simplify 
to 50. Which leaves us with 
Step 2: Simplify 
to 5. Which leaves us with 
.
Step 3: Simplify , to get your answer, 13.
