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Novay_Z [31]
2 years ago
12

Suppose a jar contains 7 red marbles and 21 blue marbles. if you reach in the jar and pull out 2 marbles at random at the same t

ime, find the probability that both are red.
Mathematics
2 answers:
Anit [1.1K]2 years ago
4 0
The probability is 1 out of 3 chance.
Tanya [424]2 years ago
4 0
 this can be answered a couple ways. it could be 7/30 or 21%.
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I need help I don't know what to do! ( / is a fraction bar!!)
kari74 [83]
#1 4/5x + 2/3x = 1 -4/15
22/15x = 11/15
x = 1/2

and can u explain what u mean by #2 and #3??

7 0
3 years ago
A sample of size 20 from a normal distribution has sample mean 3.5 and sample variance 14.75. Find 90% confidence intervals for
aleksley [76]

Answer:

Variance =9.2983, 27.6927

Standard deviation = 3.0493, 5.2624

Step-by-step explanation:

n = 20

S = 14.75

X² = chisquare

N-1 = degree of freedom

Alpha = 0.1

Alpha/2 = 0.1/2 = 0.05

1-0.1/2 = 0.95

Using statistics table

X² 19,0.05 = 30.14

X² 19, 0.95 = 10.12

A. 19(14.75)/30.14 , 19(14 75)/10.12

= 9.2983, 27.6927 for the variance of the population

B. Standard deviation = square root of variance

= √9.2983, √27.6927

= 3.0493, 5.2624

Please use attachment for better understanding

5 0
3 years ago
Determine the slope between (4, 2) and (-3, 5) ~hurry please~
SpyIntel [72]

Answer:

A.-3/7

Step-by-step explanation:

the slope formula is

m = (y2 - y1) / (x2-x1)

The point (4, 2) is (x1, y1) and the point (-3, 5) is (x2, y2). Now you have to substitute in the slope formula:

m = (5 - 2) / (-3 - 4)

m = 3 / -7

m = -3/7

7 0
2 years ago
Read 2 more answers
Figure STOP is reflected about the y-axis to obtain figure STO′P: A coordinate plane with two quadrilaterals is shown. Figure ST
gogolik [260]

Answer:

Figure STOP is congruent to figure S′T′O′P′.

Step-by-step explanation:

I just took the test

6 0
3 years ago
Help pleaseee , don’t really know how to do this :)
yawa3891 [41]

Answer:

x= -p+q+y

Step-by-step explanation:

-x on each side

y-x=p-q

-y on each side

-x=p-q-y

÷everything on both sides by ‐1

We have to divide by -1 because x can't be negative

x = -p+q+y

I really hope this is right because I don't want to let you down.

-LampteyJ

8 0
3 years ago
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