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ikadub [295]
3 years ago
6

A freight train completes its journey of 150 miles 1 hour earlier if its original speed is increased by 5 miles/hour. What is th

e train’s original speed?
a. 20 miles/hour
b. 25 miles/hour
c. 30 miles/hour
d. 35 miles/hour
Mathematics
1 answer:
loris [4]3 years ago
6 0
The answer is b. 25 miles/hour
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viktelen [127]

Answer:

The correct option is  B

Step-by-step explanation:

From the question we are told that

   The  sample size is  n  =  64

    The  proportion that choose to vaccinate the teen boys is  \r p =  0.12

considering the first statement

The 95% confidence interval is 12% ± the margin of error*standard deviation is  false because

The 95% confidence interval is is  %12 ± the margin of error

considering the second statement

The confidence interval should not be calculated due to the small sample size is true because from the central limit theorem

   np =  64 * 0.12 =  7.68

and this value is  less than 10  hence the confidence interval should not be calculated

considering the third statement

A 99% confidence interval will be smaller than the 90% confidence interval is false

  This is because as the confidence level increase (for example  from 90% to  99%) the margin of error increase which increases the confidence interval  

 

5 0
3 years ago
The product of 6 and seven times c
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Answer:

42

Step-by-step explanation:

8 0
3 years ago
It is known that 40% of adult workers have a high school diploma. If a random sample of 10 adult workers is selected, what is th
Maurinko [17]

Answer:

The expected number of adult workers with a high school diploma is 4.

Step-by-step explanation:

This random variable X can be modeled with the binomial distribution, with parameters n=10 (the sample size) and p=0.4 (the probability that a adult worker have a high school diploma).

The expected value of X is then the mean of the binomial distribution with the parameters already mentioned.

This is calculated as:

E(X)=\mu_b=n\cdot p=10\cdot0.4=4

4 0
3 years ago
A population of beetles are growing according to a linear growth model. The initial population (week 0) is P0=9, and the populat
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Answer:

y = 4x + 9

week 21

Step-by-step explanation:

first I did 37-9 and got 28 I divide that by 7 ( seven weeks) and got 4 so I know the slope is 4.

so to find how many weeks till 93 I did; 93 = 4x + 9. We have to get x by its self so I minus 9 by both sides and got 84 = 4x. So now we divid both sides by 4 to get x by its self and we end up with 21 = x

5 0
3 years ago
Suppose that in circle with center P, and a central angle, ∠OPQ, intersects minor arc OQ, where the measure of arc OQ = 82◦, and
ser-zykov [4K]

Answer:

Central Angle OPQ = Arc OQ = 82°

5x - 3 = 82°

5x = 85°

x = 17 degrees

Step-by-step explanation:

5 0
3 years ago
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