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1 answer:
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Answer:
There are <u>20 beads</u> on the necklace.
Step-by-step explanation:
Given:
A beaded necklace is 2.5 feet long. Each bead is .25 inches wide & each pair of beads is separated by 1.25 inches of chain.
Now, to find the number of beads on the necklace.
The length of necklace = 2.5 feet.
So, we convert feet into inches by using conversion factor:
<em>1 foot = 12 inches.</em>
<em>2.5 feet = 12 × 2.5 inches.</em>
<em>2.5 feet = 30 inches.</em>
<u>Thus, the length of necklace is 30 inches.</u>
Let the number of beads be
The width of each bead = 0.25 inches.
The each pair of beads is separated by 1.25 inches.
Now, we put an equation to get the number of beads:
<em>Dividing both sides by 1.50 we get:</em>
<u><em>The number of beads = 20.</em></u>
Therefore, there are 20 beads on the necklace.
Answer:
Standard deviation of the students = 0.408
The students would you have to poll to be 95% confident of the outcome within /- 2% of the vote
= 0.408 X 1600
= 652.8
Step-by-step explanation:
<u><em>Step(i):</em></u>-
Given sample size 'n' = 1600
95% confidence interval of the margin error is determined by
Level of significance = 0.05
Z₀.₀₅ = 1.96
Given Margin of error = 2% = 0.02
0.02 X √1600 = 1.96 X S.D
Standard deviation of the students = 0.408
The students would you have to poll to be 95% confident of the outcome within /- 2% of the vote
= 0.408 X 1600
= 652.8