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3 years ago

The results for a survey of 120 students who were selected randomly are listed below.

Mathematics

1 answer:

RoseWind [281]3 years ago

7 0

Answer:

Company X - 190 students

Company Y - 114 students

No phones - 76 students

Step-by-step explanation:

1) Find a multiplier to get the ratio from sample to population; to compare the sample to the population

380/120 = 3.16666667 or 3 & 1/6

380 comes from the total population of students and 120 comes from the randomly selected.

2) Use our multiplier to compare the results to the population

People with Company X

60 * 3.16667 = 190

People with Company Y

36 * 3.166667 = 114

People with no cell phone

24 * 3.166667 = 76.0000000001 = 76 (rounded)

Double check

190 + 114 + 76 = 380

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san4es73 [151]

Answer:

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Step-by-step explanation:

We will use compound interest formula:

$F=P(1+r)^t$

Where

F is future amount [what we want to figure out]

P is present amount [9000]

r is rate of interest [since we want for 6 months, the annual interest divided by 2 is r. So r = 10/2 = 5% or 0.05]

t is the time [ the time period is for 6 months so t = 1 since we already converted the interest rate to 6 month chunk]

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