Anumber is selected at random from the set (1,2,3,4,5,6,7,8,9,10). let 'a' be the event that a number greater than 6 is selected and 'b' be the event that a 'square' is selected.
a) list the sample space.
b) list the events a and b
c) list a 'u' b
d) find pr (a)
e) find pr (a 'u' b)
me pleae.

Step-by-step explanation:

a) sample space = 10

I.e the total number of possible outcomes

b) A = {7,8,9,10 }

B = {4,9

c) A U B = {4,7,8,9,10}

d) pr (A) = no of events in A÷ total sample space

pr (A) = 4/10

=2/10

e) pr( A U B) = 5/ 10

= ½

answer:

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

explanation:

service only with 20% tip  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

in the opening of the question the word 'service' is associated only with the pretax value.

the closing part of the question asks: how much did she pay for the  

service

−−−−−−  

so technically the answer is  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

however, the intention of the question provider may have been that your answer is to be  

$

87.12

(

1

+

8

100

)

=

$

94.09

to 2 decimal places.

'

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

tony b

mar 21, 2017

answer:

trying to explain it another way

explanation:

service charge  

.

→

$

72.60

20% tip  

20

100

×

$

72.60

=

$

14.52

−−−−−−  

←

add

$

87.12

tax  

8

100

×

$

87.12

=

$

6.97

−−−−−  

←

add

$

94.09

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