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hammer [34]
3 years ago
14

Gregory predicts that 310 people will attend the spring play. And there was an actual total of 220 people who attended the sprin

g play. What is the percent error.
Mathematics
1 answer:
rodikova [14]3 years ago
8 0
310 - 220 = 90
90/310 = x/100 (cross multiplication) 
9000 = 310x
9000/310 = x
x = around 29%
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3 years ago
If the family spent 151 dollars then how many people went?​
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y=21x+25

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151=21x+25

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3 years ago
At a university, 12% of students smoke. Calculate the expected number of smokers in a random sample of 140 students from this un
Masteriza [31]

Answer:

a) The expected number of smokers in a random sample of 140 students from this university is 16.8 smokers.

b) No, it is unlikely that smoking habits and waking up early to go to the gym on Saturday are independent.

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To calculate the expected numbers of smokers in a sample with size n=140 and proportion p=12%, we use the expected value of the binomial distribution:

E(x)=n\cdot p=140\cdot 0.12=16.8

The expected number of smokers in a random sample of 140 students from this university is 16.8 smokers.

If we take a sample at the opening of the gym, the sample is not expected to be representative of the population of the students. Most of the students that go to the gym usually have healthy habits, so the proportions of smokers is expected to be lower than the average of the university population.

4 0
2 years ago
Ricky Bobby wants to buy a new automobile for $55,000 in 8 years. How much money must Ricky's original investment be if he makes
laila [671]

Answer:

PV= $40,279.36

Step-by-step explanation:

Giving the following information:

Number of periods= 8*12= 96 months

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<u>To calculate the initial investment, we need to use the following formula:</u>

PV= FV/(1+i)^n

PV= 55,000 / (1.00325^96)

PV= $40,279.36

4 0
2 years ago
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