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3 years ago

24 students in a class took an algebra test. If 18 students passed the test what percent passed?

Mathematics

2 answers:

Leya [2.2K]3 years ago

4 0

18 out of 24 is 18/24 which is 18/24*100=75 percent.

zmey [24]3 years ago

4 0

Answer:75%

Step-by-step explanation:

x% of 24=18

x/100 x 24=18

24x/100=18

Cross multiply

24x=18x100

24x=1800

Divide both sides by 24

24x/24=1800/24

x=75

75 percent pass the test

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A magician has a collection of 52 cards, with 26 red and 26 black cards. Four of these cards are classified as 'special', and tw

Brums [2.3K]

Answer:

option B (28/52)

Step-by-step explanation:

from probability

P(A∪B)=P(A)+P(B)-P(A∩B)

where

P(A∪B) = probability that event A or B happen

P(A∩B) = probability that event A and B happen simultaneously

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P(B) = probability that event B happen

the probability that the card is special or red

P( special or red)= P(special) + P(red) - P( special and red)

since

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therefore

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(option B)

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3 years ago

The print on the package of -watt General Electric soft-white light-bulbs says that these bulbs have an average life of hours. A

Naddika [18.5K]

Answer:

Hi your question is incomplete attached below is the complete question

answer : p ( X < 725 ) = 0.0116

Step-by-step explanation:

Given data:

Average life of bulbs (μ ) = 750 hours

standard deviation (б ) = 55 hours

n ( sample size ) = 25

X = 725

<u>Probability that the mean life of a random sample of 25 bulbs will be less than725 hours </u>

p ( X < 725 ) = p (( X - μ )/ б √n < 725 - 750 / 55√25 )

= P ( Z > - 2.27 )

Hence P ( X < 725 ) = 0.0116 ( using Z-table )

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