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3 years ago

The probability distribution for a random variable x is given in the table Find the probability that X<=20

Mathematics

2 answers:

Eddi Din [679]3 years ago

5 0

Answer:

Step-by-step explanation:

It's right for accelus

ikadub [295]3 years ago

4 0

Answer:

Step-by-step explanation:

I guessed on the problem and it was right

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Which equation has the same soultions as x^2+6×-7=0

blagie [28]

$x^2+6x-7=0 \\ a=1 \\ b= 6 \\ c=-7 \\ \\ \boxed{\boxed{\Delta=b^2-4ac}} \\ \\ \Delta=6^2-4*1*(-7) \\ \Delta=36-(-28) \\ \Delta=64 \\ \Delta\ \textgreater \ 0 \Rightarrow \text{we have 2 solutions :} X_1 \ and X_2 \\ \\ \boxed{X_1= \frac{-b- \sqrt{\Delta} }{2a} } \Rightarrow X_1= \frac{-6-8}{2}=-7 \\ \\ \boxed{X_2= \frac{-b+ \sqrt{\Delta} }{2a} } \Rightarrow X_2= \frac{-6+8}{2} =1$

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3 years ago

Help, brainiest, five stars, and thanks for correct answers.

Alisiya [41]

Answer: help this werd account just asked me on a date and i dont even know them thay swared and i did not understand do you know what to do i know this is not an aser but pleas help......

Step-by-step explanation: please.........

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3 years ago

PLEASE HELP ME PLEASE

a_sh-v [17]

Answer:

20 bottles

Step-by-step explanation:

Number of bottles

$= 5 \div \frac{1}{4} \\ \\ = 5 \times \frac{4}{1} \\ \\ = 20$

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2 years ago

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Everyone get off of social and help people on here! -_-

Marizza181 [45]

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3 years ago

Enny White is shopping for CDs. She decides to purchase 3 movie soundtracks. The music store has 7 different movie soundtracks i

Gala2k [10]

Answer:

35 different selections of soundtracks are possible

Step-by-step explanation:

Total number of soundtracks available at the store = 7

Enny decides to purchase 3 movie soundtracks.

So, in this problem we have to find in how many ways can Enny chose 3 soundtracks out of 7. The order in which the soundtracks are chosen does not matter e.g soundtracks A,B and C are the same as soundtracks B,C and A.

In an arrangement when the order does not matter, we use combinations to find the total possible number of arrangements or selections.

So, for this problem choosing 3 soundtracks out of 7 means forming combinations from 7 objects taken 3 at a time. This can be represented mathematically as:

$^{7}C_{3}$

The general formula for combinations is:

$^{n}C_{r}=\frac{n!}{r!\times(n-r)!}$

Using the values, we get:

$^{7}C_{3}=\frac{7!}{3!\times(7-3)!} =35$

This means, Enny can make 35 different selections of soundtracks.

7 0

3 years ago