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Stels [109]
3 years ago
15

A bag contains 3 red marbles and 4 blue marbles.A marble is taken out from the bag and replaced. Another marble is taken from th

e bag. Work out the probability that the two marbles taken from the bag are the same colour.
Mathematics
2 answers:
My name is Ann [436]3 years ago
5 0
A bag contains 3 red marbles and 4 blue marbles. a marble is taken at random and replaced. Another marble is taken from the bag. Work out the probability that the two marbles taken from the bag are the same color.

<span>Total number of marbles in the bag is 3 + 4 = 7.<span>The problem asks for the probability of (RR) or (BB).</span>It's worthy to note we are replacing the balls after each draw, which means we always have 7 to draw from</span>Since each draw is independent, we take the product of each event for the total event probability.

P(RR) = 3/7 * 3/7 = 9/49
P(BB) = 4/7 * 4/7 = 16/49

We want to know P(RR) + P(BB)
<span>P(RR) + P(BB) = 9/49 + 16/49 = 25/49</span>
allsm [11]3 years ago
4 0
I think 2/7 would be the probability 
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The answer is 19 (P = people)

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<em>x = \frac{15*152}{120}</em>

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Answer:  a) 7

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<u>Step-by-step explanation:</u>

Inverse is when the x's and y's are swapped.

a)

f(7) = 22 means ..... when x = 7, then y = 22

The inverse is ..... when x = 22, then y = 7

b)

f⁻¹(f(c)) means ...... when x = f(c), then y = c

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El peso que cargan tres pick-ups están en la razón de 2:6:7, cuánto carga el pick-up más grande, si el pick up menor carga 1500k
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Utilizando proporciones, hay que el pick-up más grande carga 5250 kg.

  • Este problema se resuelve por proporciones, por médio de una regla de três.

El peso que cargan tres pick-ups están en la razón de 2:6:7

  • 2 + 6 + 7 = 15.
  • O sea, el pick-up menor carga \frac{2}{15} de el total, que es equivalente a 1500 kg.
  • El pick-up más grande carga \frac{7}{15} de el total, que es equivalente a x kg.

La regla de três es:

\frac{2}{15} - 1500 kg

\frac{7}{15} - x kg

Aplicando multiplicación cruzada:

\frac{2x}{15} = \frac{1500(7)}{15}

2x = 1500(7)

x = \frac{1500(7)}{2}

x = 5250

El pick-up más grande carga 5250 kg.

Un problema similar es dado en brainly.com/question/24615636

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