I need help 7th grade math i need all the answers correct please ASAP
2 answers:
Answer:
- 7.98: $2.51/kg
- 8.39: $2.43/kg
- the 8.39 kg bag is the better buy
Step-by-step explanation:
To find the unit price, divide the price by the number of units. Here, the unit of interest is 1 kg.
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Unit price of 7.98 kg bag:
$19.99/(7.98 kg) = $2.51 /kg
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Unit price of 8.39 kg bag:
$20.38/(8.39 kg) = $2.43 /kg
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The 8.39 kg bag has a lower cost per kilogram, so is considered the better buy.
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Answer: b) 84
Step-by-step explanation:
Let p be the prior estimate of the required proportion.
As per given , we have
p =0.5 (The probability of getting heads on a fair coin is 0.5)
Significance level :
Critical z-value (using z-value table ) :
Confidence interval width : w= 0.18
Thus , the margin of error :
Formula to find the sample size ( if prior estimate of proportion is known.):-
Substitute the values , we get
Simplify ,
[Round of to the next whole number.]
Hence, the number of times we would have to flip the coin =<u>84</u>
hence, the correct answer is b) 84