Box of Number

Probability Level 1

In a box we labeled 50 cards , from 1 to 50. We then randomly select a card. What is the probability in percent that the labeled card is a number greater than 8?

60% 70% 80% 84%

Matin Naseri by Matin Naseri , 17, Afghanistan

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3 solutions

Matin Naseri
Jan 9, 2018

s t e p 1 \large{step1} : 100 / 50 = 2 \large {100}/{50}=2

s t e p 2 \large{step2} : 50 − 8 = 42 \large 50-8=42

s t e p 3 \large{step3} : 42 × 2 = 84 \large 42×2=84

Hence The answer is 84 \boxed {84}

3 Helpful 0 Interesting 0 Brilliant 0 Confused

Note that the = = sign is used to indicate equality in math.

But what you had wrote is:

  • 1 = 2

  • 2 = 42

  • 3 = 84

Please correct it.

Munem Shahriar - 3 years, 5 months ago

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No you didn't understand that I had Used the equality notation ( = ) \large{(=}) To showed that which step has contiend which information about solution. But then I used this notaion ( : ) \large{(:)} .

Matin Naseri - 3 years, 5 months ago
. .
Apr 2, 2021

50-8=42

42 50 = 84 100 = 84 % \displaystyle \frac { 42 } { 50 } = \frac { 84 } { 100 } = \boxed { 84\% } .

0 Helpful 0 Interesting 0 Brilliant 0 Confused

50 − 8 50 × 100 = 42 50 × 100 = 84 % \frac{50 - 8}{50} \times 100 = \frac{42}{50} \times 100 = \boxed{84 \%}

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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