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Zarrin [17]
3 years ago
9

HELP ASAP PLZ

Mathematics
2 answers:
blagie [28]3 years ago
4 0
9/38 x 9 /38 =81/144 both of the events are indepent
Alisiya [41]3 years ago
4 0

Answer:  

The correct option is D. 9/38x9/38 =81/1444

Step-by-step explanation:

Total number of marbles in the bag = 38

Number of white marbles in the bag = 14

Number of gray marbles in the bag = 9

Number of blue marbles in the bag = 15

We need to find the probability that Jane takes out a gray marble in both draws

\text{Probability that Jane draws gray marble in first draw = }\frac{9}{38}

Given that : Then Jane replaces the marble for the second draw

\text{Probability that Jane draws gray marble in second draw = }\frac{9}{38}

\text{Probability that Jane draws gray marble in both draws = }\frac{9}{38}\times \frac{9}{38}

\text{Probability that Jane draws gray marble in both draws = }\frac{81}{1444}

Therefore, The correct option is D. 9/38x9/38 =81/1444

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The new ointment was applied to four locations, and a control was applied to the other four. How many different choices were the
lubasha [3.4K]

Answer:

there are 70 possible choices for the four locations to apply the new ointment

Step-by-step explanation:

Since we have a total of 8 locations ( 4 to the new ointment and 4 to the control) ,  each one can be chosen and since the order of the locations that are chosen for the new ointment is not relevant  , then we know that the number of choices is given by the number of combinations of 4 elements in 8

number of combinations = 8 possible locations to the first ointment * 7 possible locations to the second ( since the first one was already located) * 6 to the third * 5 locations for the fourth / number of times the same combination is repeated ( the same locations but in different positions) = 8*7*6*5 / (4 possible positions for the first ointment* 3 possible positions to the second ointment (since the first one was already located * 2 possible positions of the third * 1 possible position of the fourth)

therefore

number of combinations = 8*7*6*5/(4*3*2*1 ) = 8!/((8-4)!*4!) = 70 possible combinations

thus there are 70 possible choices for the four locations to apply the new ointment

6 0
3 years ago
The time between failures of a machine has an exponential distribution with parameter l. Suppose that the prior distribution for
ololo11 [35]
I'm like girl do you have plans. Can't keep my heart in your hands. She kicked me out I'm like vro.
6 0
3 years ago
(10) Does the table show a proportional relationship?
Blababa [14]

Answer:

No

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Luke shaded 20 squares on his hundredths grid. Bekka shaded 30 squares on her hundredths grid. write two decimals greater than L
astra-53 [7]
21.3 and 22.5. and 12.3 13.5
8 0
3 years ago
Anyone help me pls,find the area of each figure(All lines meet at right angles.)​
baherus [9]

Answer:

The Area of the required figure is  315\:cm^2

Step-by-step explanation:

Area = (21\times 7)+(14\times 7) + (7\times 10)\\\\=147+98+70\\\\=315

Best Regards!

3 0
3 years ago
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