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zaharov [31]
3 years ago
13

8. Glass Garbage Generation A survey found that the American family generates an average of 17.2 pounds of glass garbage each ye

ar. Assume the standard deviation of the distribution is 2.5 pounds. Find the probability that the mean of a sample of 55 families will be between 17 and 18 pounds. 0.7135 Source: Michael D. Shook and Robert L. Shook, The Book of Odds. 9. College Costs The mean undergraduate cost for tuition, fees, room, and board for four-year institutions was $26,489 for a recent academic year. Suppose
Mathematics
1 answer:
Tcecarenko [31]3 years ago
5 0

Answer:

.7147

Step-by-step explanation:

Let P be the probability of 55 families having mean more than 17

P { (17-17.2)/ (2.5/√55) }

P(- 0.5933 )

= - .2765  [ From the z table ]

P be the probability of 55 families having mean less than 18

P { (18 -17.2)/ (2.5/√55) }

P( 2.3732 )

= .9912   [ From the z table ]

Probability of mean between 17 and 18

= .9912 - .2765

= .7147

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Answer is -10


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7 0
3 years ago
Aidan has 20 ft of fence with which to build a rectangular dog run. What is the maximum area he can enclose?
butalik [34]
Assuming this Fence enclosment will be in the shape of a rectangle we will use the equation used to find the area of a rectangle, b×h=a

Using this formula we then must pick out factors used to create, in which the perimeter will add up to 20

·5,5,5,5 (25)
·8,2,8,2 (16)
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using this we can learn<span> that the maximum area that can be exclosed by this is 25, because the 2 perimiter lengths that define this rectangle would be 5 and 5.

</span>b(5)×h(5)=25(a)

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3 0
3 years ago
(a)
mariarad [96]

Answer:

x + 4x = 90

x = 90/5 = 18°

Step-by-step explanation:

3 0
3 years ago
Solve -5 √x =-15<br> A. X= -9<br> B. X= -7<br> C. X= 9<br> D. X= 7
Leokris [45]
Divide both sides by -5
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8 0
3 years ago
Read 2 more answers
A ticket for a seat at a school play costs £2.95
Levart [38]

Answer:

Answer vary :

2.95(21 times 39) = $2,416.05

Step-by-step explanation:

honestly in my opinion that the answer. so we’re trying to find out how much money the school will earn.

if each seat cost 2.95 we need to find out how many seats are their?

-21 times 39 = 819

we multiplied the rows and seats find out how many seats their are and the answer is 819.

after you do that now we have to find out how much money they will earn from selling all 819 seats.

-819 times 2.95 = 2,416.05

we then multiplie all of the seats wich is 819 seats by 2.95 wich is the cost of one seat and got 2,416.05, and that’s the answer we’ve been looking for.

and that’s how I got my answer.

6 0
3 years ago
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