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serious [3.7K]
3 years ago
15

A marketing firm for Cobra Auto Security Systems mailed out a survey to 35% of the households in New York City, Washington DC, a

nd Chicago to determine the market for auto security systems. According to the respondents of the survey, 55% of the population uses public transportation and does not own an automobile. So, the marketing firm concluded that 55% of all Americans use public transportation and do not own an automobile. Which of the following statements is correct?
A. This method of sampling is neither biased nor unbiased.

B. This method of sampling can be considered both biased and unbiased.

C. This method of sampling is biased.

D. This method of sampling is unbiased.
Mathematics
1 answer:
san4es73 [151]3 years ago
7 0
Your answer would be B.
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the point (-1,0.5) lies on the graph of f^-1(x)=2^x based on this information, which point lies on the graph of f(x)=log2x
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3 years ago
Please help me, i will give brainliest!! help me please
Minchanka [31]

The answers are :

10) 25 : 24

11) 24 : 5

12) 36 : 5

13) 7 : 3

14) 15 : 1

<u>Ratio = Number of event 1 : Number of event 2</u> (in same unit, if necessary)

<u>10</u>

Girls preferring orange juice : Boys preferring orange juice

50 : 48 (Divide by 2 on both sides)

25 : 24

<u>11</u>

Boys preferring orange juice : Boys preferring grapefruit juice

48 : 10 (Divide by 2 on both sides)

24 : 5

Remember :

  • <u>1 minute = 60 seconds</u>
  • <u>1 week = 7 days</u>
  • <u>1 hour = 60 minutes</u>

<u />

<u>12</u>

3 minutes : 25 seconds

3 × 60 : 25 (Divide by 5 on both sides)

3 × 12 : 5

36 : 5

<u>13</u>

2 weeks : 6 days

2 × 7 : 6 (Divide by 2 on both sides)

7 : 3

<u>14</u>

5 hours : 20 minutes

5 × 60 : 20 (Divide by 20 on both sides)

5 × 3 : 1

15 : 1

4 0
1 year ago
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