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IrinaK [193]
1 year ago
12

(2) The scores obtained by a class of

Mathematics
1 answer:
SVETLANKA909090 [29]1 year ago
5 0

Answer:

Below.

Step-by-step explanation:

2)

(a) Prob(exactly 6 marks) =  2/10 = 1/5

(b) Prob(At least 6 marks) = 5/10 = 1/2.

3)

Prob ( Queen of hearts) = 1/52

4)

Probability of a 6 in one throw = 1/6.

So expected number of 6's in 300 throws

= 1/6 * 300

= 50.

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tatiyna

Answer:

x=1/2 y =1

Step-by-step explanation:

(-4x+2y)/2x5=0/2x5

10x+3y=8

(-2x+y)x5=0

10x+3y=8

-10x+5y=0

10x+3y=8

8y=8

y=1

x=1/2

5 0
2 years ago
A health study tracked a group of person for five years. At the beginning of the study, 20% were classified as heavy smokers, 30
Aleks04 [339]

Answer: 0.421

Step-by-step explanation:

Heavy smoker = 20%

Light smoker = 30%

Non smokers = 50%

We can assume that the probability that a non-smoker is going to die in the next 5 years be y.

Since light smokers were twice as likely as nonsmokers to die during the five-year study, the probability will be:

= 2 × y = 2y

Probability for the Heavy smokers will be:= 2 × 2y = 4y

The expected number of people that will die for each in the next 5 years will be:

Non smoker:

= 50% × y

= 0.5 × y

= 0.5y

Light smoker:

= 30% × 2y

= 0.3 × 2y.

= 0.6y

Heavy smoker:

= 20% × 4y.

= 0.2 × 4y

= 0.8y

Total = 0.5y + 0.6y + 0.8y = 1.9y

The probability that the participant was a heavy smoker will be:

= 0.8y/1.9y

= 0.421

3 0
3 years ago
Factor Completely 5v^2-5v-100
bogdanovich [222]

5 {v }^{2}  - 5v - 100 \\  = 5( {v}^{2}  - v - 25) \\  = 5({v}^{2}   + 4v - 5v - 20) \\  = 5[v(v + 4) - 5(v + 4)] \\  = 5(v - 5)(v + 4)

4 0
3 years ago
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Calculate the markup on an item that cost a store $300.00 and will be marked up 55%​
Anni [7]

Answer:

It would be $465 marked up.

Step-by-step explanation:

55% of 300 is 165.

So marked up its 465 and marked down its 135.

3 0
2 years ago
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HELP PLEASE!!!! Jerome has 15 albums with 7 baseball cards in each. His friend gives him 8 packages of baseball cards with 13 in
hichkok12 [17]

albums:  15*7 = 105 cards

packages : 8*13 = 104 cards

extra cards 10

total cards =albums+ packages + extra cards

                = 105+ 104 + 10

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4 0
3 years ago
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