(D) Total number of students $= 10 + 13 + 12 + 5 = 40$.Let $E$ be the event that the selected student has blood group $B$.The number of students with

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(D) Total number of students $= 10 + 13 + 12 + 5 = 40$.Let $E$ be the event that the selected student has blood group $B$.The number of students with blood group $B$ is $12$.The probability $P(E)$ is given by the ratio of the number of favorable outcomes to the total number of outcomes.$P(E) = \frac{\text{Number of students with blood group } B}{\text{Total number of students}} = \frac{12}{40}$.Simplifying the fraction by dividing both numerator and denominator by $4$,we get $P(E) = \frac{3}{10}$.

Class 9 Mathematics Probability Mix Examples - Probability

Easy

In a medical examination of students of a class,the following blood groups are recorded:
Blood group $A, AB, B, O$
Number of students $10, 13, 12, 5$

$A$ student is selected at random from the class. The probability that he/she has blood group $B$,is:

A
$\frac{1}{4}$
B
$\frac{13}{40}$
C
$\frac{1}{8}$
D
$\frac{3}{10}$

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Mix Examples - Probability

Out of $30$ days, the forecast predicted by the weather department proved to be true on $20$ days. If one day is chosen at random from these $30$ days, what is the probability that the forecast proved to be false?

Easy

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Three coins were tossed $30$ times simultaneously. Each time the number of heads occurring was noted down as follows:
$0, 1, 2, 2, 1, 2, 3, 1, 3, 0,$
$1, 3, 1, 1, 2, 2, 0, 1, 2, 1,$
$3, 0, 0, 1, 1, 2, 3, 2, 2, 0$
Prepare a frequency distribution table for the data given above.

Medium

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When a balanced die is thrown,the probability of getting $3$ is .........

Easy

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$A$ card is drawn at random from a well-shuffled pack of $52$ cards. Find the probability of that card being a queen.

Easy

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$A$ recent survey found that the ages of workers in a factory is distributed as follows:

Age (in years) $20-29$ $30-39$ $40-49$ $50-59$ $60$ and above

Number of workers $38$ $27$ $86$ $46$ $3$

If a person is selected at random,find the probability that the person is under $40$ years.

Medium

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Age (in years)	$20-29$	$30-39$	$40-49$	$50-59$	$60$ and above
Number of workers	$38$	$27$	$86$	$46$	$3$

In a medical examination of students of a class,the following blood groups are recorded:Blood group$A, AB, B, O$Number of students$10, 13, 12, 5$$A$ student is selected at random from the class. The probability that he/she has blood group $B$,is:

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Out of $30$ days, the forecast predicted by the weather department proved to be true on $20$ days. If one day is chosen at random from these $30$ days, what is the probability that the forecast proved to be false?

Three coins were tossed $30$ times simultaneously. Each time the number of heads occurring was noted down as follows:$0, 1, 2, 2, 1, 2, 3, 1, 3, 0,$$1, 3, 1, 1, 2, 2, 0, 1, 2, 1,$$3, 0, 0, 1, 1, 2, 3, 2, 2, 0$Prepare a frequency distribution table for the data given above.

When a balanced die is thrown,the probability of getting $3$ is .........

$A$ card is drawn at random from a well-shuffled pack of $52$ cards. Find the probability of that card being a queen.

$A$ recent survey found that the ages of workers in a factory is distributed as follows: Age (in years) $20-29$ $30-39$ $40-49$ $50-59$ $60$ and above Number of workers $38$ $27$ $86$ $46$ $3$ If a person is selected at random,find the probability that the person is under $40$ years.

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In a medical examination of students of a class,the following blood groups are recorded:
Blood group $A, AB, B, O$
Number of students $10, 13, 12, 5$

$A$ student is selected at random from the class. The probability that he/she has blood group $B$,is:

Three coins were tossed $30$ times simultaneously. Each time the number of heads occurring was noted down as follows:
$0, 1, 2, 2, 1, 2, 3, 1, 3, 0,$
$1, 3, 1, 1, 2, 2, 0, 1, 2, 1,$
$3, 0, 0, 1, 1, 2, 3, 2, 2, 0$
Prepare a frequency distribution table for the data given above.

$A$ recent survey found that the ages of workers in a factory is distributed as follows:

Age (in years) $20-29$ $30-39$ $40-49$ $50-59$ $60$ and above

Number of workers $38$ $27$ $86$ $46$ $3$

If a person is selected at random,find the probability that the person is under $40$ years.