Jake recorded a special album in honor of mother’s day his mom was so excited she purchased 40% of the copies in the store she h as 80 copies of the cd how many cds did the stores have for sale
2 answers:
Answer:
200 CD's.
Step-by-step explanation:
Jake recorded a special album in honor of mother's day. His mom was so excited that she purchased 40% of the copies in the store.
we have tell the total number of CD's in the store.
Let total number of CD's available in the store was = A
Then 40% of the total numbers of CD's = A×40% = 0.04 A
Since 0.04A = 80
A = 80/0.04 = 200
Therefore there were 200 CD's in the store for the sale.
The answer is 200. how I got my answer. I simply realised that I could not multiply 40% easily to 100%. So I spit it in half, and made 20%=40. then I multiplied 20%×5=100% and I also multiplied 40×5=200. I hope this helps!
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Answer:
2.25
Step-by-step explanation:
The total frequency is:
20 + 12 + 6 + 2 = 40
Calculate the probability of each score:
P(X=3) = 20/40 = 0.50
P(X=2) = 12/40 = 0.30
P(X=1) = 6/40 = 0.15
P(X=0) = 2/40 = 0.05
So the expected value is:
E = (3)(0.50) + (2)(0.30) + (1)(0.15) + (0)(0.05)
E = 2.25
Answer:
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Step-by-step explanation:
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