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Snezhnost [94]
3 years ago
13

Please help!!! (This is math)

Mathematics
2 answers:
____ [38]3 years ago
5 0

Answer:

800

Step-by-step explanation:

olganol [36]3 years ago
4 0
I think the answer is $800 :)
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A track star runs two races on a certain day. The probability thathe wins the first race is 0.7, the probability that he wins th
NARA [144]

Answer:

a) 80% probability that he wins at least one race.

b) 30% probability that he wins exactly one race.

c) 20% probability that he wins neither race.

Step-by-step explanation:

We solve this problem building the Venn's diagram of these probabilities.

I am going to say that:

A is the probability that he wins the first race.

B is the probability that he wins the second race.

C is the probability that he does not win any of these races.

We have that:

A = a + (A \cap B)

In which a is the probability that he wins the first race but not the second and A \cap B is the probability that he wins both these races.

By the same logic, we have that:

B = b + (A \cap B)

The probability that he wins both races is 0.5.

This means that A \cap B = 0.5

The probability that he wins the second race is 0.6

This means that B = 0.6

B = b + (A \cap B)

0.6 = b + 0.5

b = 0.1

The probability that he wins the first race is 0.7.

This means that A = 0.6

A = a + (A \cap B)

0.7 = a + 0.5

a = 0.2

A) he wins at least one race.

This is

P = a + b + (A \cap B) = 0.2 + 0.1 + 0.5 = 0.8

There is an 80% probability that he wins at least one race.

B) he wins exactly one race.

This is

P = a + b = 0.2 + 0.1 = 0.3

There is a 30% probability that he wins exactly one race.

C) he wins neither race

Either he wins at least one race, or he wins neither. The sum of these probabilities is 100%.

From a), we have that there is an 80% probability that he wins at least one race.

So there is a 100-80 = 20% probability that he wins neither race.

6 0
3 years ago
What is true about equivalent fraction
lisabon 2012 [21]
Numerators will be equal after the multiplication.
5 0
3 years ago
...
melisa1 [442]

Answer:

Maple calculator used_____

4 0
3 years ago
Read 2 more answers
The length of a rectangle is three more than it’s width. the perimeter is 86 cm. Find the length and width of the rectangle. Wri
Mariana [72]
Half-perimeter=length+width=width+3+width=43, 2×width=40 so width=20cm and length=23cm.
6 0
3 years ago
Please answer this question, i need it to be explained also.please
Anettt [7]

Answer:

6.6

Step-by-step explanation:

If you minus 54.2 and 47.6 you get 6.6

54.2

-<u>47.6</u>

6.6

8 0
2 years ago
Read 2 more answers
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