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scZoUnD [109]
2 years ago
10

D. a set of cards has 25 cards with stars, 15 cards with squares, and 10 cards with circles. find the probability of each event

when a card is chosen at random. a. square b. cicle c. star or circle d. not a circle or square
Mathematics
2 answers:
Dvinal [7]2 years ago
8 0

Answer:

look below

Step-by-step explanation:

The probability of each of the cards can be found by dividing each of them by the sum of all the numbers:

P of picking card with star:

25/50=0.5

Card with square:

15/50=3/10=0.3

Card with circle: 10/50=1/5=0.2

We can then put these values into parts a,b,c, and d:

a) 3/10 chance or 30%

b) 1/5 chance or 20%

c) 1/2+1/5=7/10 chance or 70%

d) 1-0.3-0.2=1/2 chance or 50%

Mrac [35]2 years ago
8 0

Answer:

a. 3/10 b. 1/5 c. 7/10 d. 1/2

Step-by-step explanation:

a. Probabily of a square being chosen is 3/10
b. Probabily of a circle being chosen is 1/5
c. Probabily of a star or circle being chosen is 7/10
d. Probabily of a circle or square not being chosen is 1/2

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The table show the age in years of employees in a company
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Answer:

A. 24 ≤ a < 26.

B. 22.5

Step-by-step explanation:

A. Determination of the modal class interval.

Mode is the class with the highest frequency.

From the table given above, the highest frequency is 8, therefore the class will the highest frequency is:

24 ≤ a < 26.

B. To obtain the mean, we must determine the class mark. This is illustrated below:

Class >>>>> class mark >>> frequency

18 – 19 >>>> 18.5 >>>>>>>>> 3

20 – 21 >>> 20.5 >>>>>>>> 2

22 – 23 >>> 22.5 >>>>>>>> 7

24 – 25 >>> 24.5 >>>>>>>> 8

26 >>>>>>>> 26 >>>>>>>>> 0

The mean is given by the summation of the product of the class mark and frequency divided by the total frequency. This is illustrated below:

Mean = [(18.5x3) + (20.5x2) + (22.5x7) + (24.5x8) + (26x0)] / (3+2+7+8+0)

Mean = (55.5 + 41 + 157.5 + 196 + 0)/20

Mean = 450/20

Mean = 22.5

Therefore, the mean age is 22.5

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3 years ago
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Explanation:
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