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amid [387]
3 years ago
6

A car salesman is stringing banners from the top of the roof to a fence pole 20 feet away. The top of the roof is 29 feet from t

he ground. The fence pole is 18 feet high. How many feet of banner rope does he need to reach from the rooftop to the fence pole?
Mathematics
1 answer:
7nadin3 [17]3 years ago
5 0

Answer:

20.88 feet

Step-by-step explanation:

First sketch your problem

identify the right angle triangle in the sketch with a=20ft, b=6 ft and c=?

apply Pythagorean relation, a²+b²=c²

=20²+6²=c²

c²=436

c=20.88 ft

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Lauren is given a 12% pay rise. Her new salary is £24,080
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21,500

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Juan earned 60 points on his last test. If there were 75 possible points, what was his percent grade?
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Juan is still on the balcony how did he take the test?-

Step-by-step explanation:

5 0
3 years ago
Seven thousand lottery tickets are sold for $5 each. One ticket will win $2,000, two tickets will win $750 each, and five ticket
Keith_Richards [23]

Answer:

a) The distribution for the random variable X is given by:

X       |           -5         |    95        |      745      |        1995     |

P(X)   |  6992/7000  |  5/7000  |     2/7000 |       1/7000  |

b) E(X)=-4.43. That means if we buy an individual ticket by $5 on this lottery the expected value of loss if $4.43.

c) Sd(X)=\sqrt{Var(X)}=\sqrt{738.947}=27.184

Step-by-step explanation:

In statistics and probability analysis, the expected value "is calculated by multiplying each of the possible outcomes by the likelihood each outcome will occur and then summing all of those values".

The variance of a random variable Var(X) is the expected value of the squared deviation from the mean of X, E(X).

And the standard deviation of a random variable X is just the square root of the variance.

Part a

The info given is:

N=7000 represent the number of tickets sold

$5 is the price for any ticket

Number of tickets with a prize of $2000 =1

Number of tickets with a prize of $750=2

Number of tickets with a prize of $100=5

Let X represent the random variable net gain when we buy an individual ticket. The possible values that X can assume are:

___________________________

Ticket price    Prize     Net gain (X)

___________________________

5                     2000       1995

5                     750          745

5                     100           95

5                      0              -5

___________________________

Now we can find the probability for each value of X

P(X=1995)=1/7000, since we ave just one prize of $2000

P(X=745)=2/7000, since we have two prizes of $750

P(X=95)=5/7000, since we have 5 prizes of $100

P(X=-5)=6992/7000. since we have 6992 prizes of $0.

So then the random variable is given by this table

X       |           -5         |    95        |      745      |        1995     |

P(X)   |  6992/7000  |  5/7000  |     2/7000 |       1/7000  |

Part b

In order to calculate the expected value we can use the following formula:

E(X)=\sum_{i=1}^n X_i P(X_i)

And if we use the values obtained we got:

E(X)=(-5)*(\frac{6992}{7000})+(95)(\frac{5}{7000})+(745)(\frac{2}{7000})+(1995)(\frac{1}{7000})=\frac{-31000}{7000}=-4.43

That means if we buy an individual ticket by $5 on this lottery the expected value of loss if $4.43.

Part c

In order to find the standard deviation we need to find first the second moment, given by :

E(X^2)=\sum_{i=1}^n X^2_i P(X_i)

And using the formula we got:

E(X^2)=(25)*(\frac{6992}{7000})+(9025)(\frac{5}{7000})+(555025)(\frac{2}{7000})+(3980025)(\frac{1}{7000})=\frac{5310000}{7000}=758.571

Then we can find the variance with the following formula:

Var(X)=E(X^2)-[E(X)]^2 =758.571-(-4.43)^2 =738.947

And then the standard deviation would be given by:

Sd(X)=\sqrt{Var(X)}=\sqrt{738.947}=27.184

5 0
3 years ago
A student bought a juice pouch forn$2.50 and 3 bags of chips. The total cost was $5.05.Write and solve an equation to determine
Oksana_A [137]

Answer:

The cost of a bag of chips is c=\$0.85

Step-by-step explanation:

Let

c ----> the cost of a bag of chips

we know that

The cost of a juice pouch ($2.50) plus the cost of 3 bags of chips must be equal to $5.05

The cost of 3 bags of chips is equal to multiply 3 by its cost c

so

The linear equation that represent this situation is

2.50+3c=5.05

solve for c

Subtract 2.50 both sides

3c=5.05-2.50

3c=2.55

Divide by 3 both sides

c=2.55/3

c=\$0.85

7 0
3 years ago
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