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faltersainse [42]
3 years ago
6

the probability that jenya recieves 4 spam-emails is 4% . If she recieves 520 emails a week, how many can you expect to be spam?

Mathematics
1 answer:
Vlada [557]3 years ago
7 0
20.8 or if you have to round, 21
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Assume that for a particular tire brand, the probability of wearing out before 30,000 miles is 0.25. For someone who buys a set
Hatshy [7]

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The probability that all will last at least 30,000 miles is 0.3164.

Step-by-step explanation:

Consider the provided information.

For a particular tire brand, the probability of wearing out before 30,000 miles is 0.25. Someone who buys a set of four of these tires,

That means the probability of not wearing out is 1-0.25 = 0.75

Now use the binomial distribution formula.

^nC_r (p^{n-r})(q^r)

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1 \times 0.75^4

0.3164

The probability that all will last at least 30,000 miles is 0.3164.

8 0
3 years ago
Is -4 a solution to the equation ?
Novosadov [1.4K]

9514 1404 393

Answer:

  No

Step-by-step explanation:

Put the value where the variable is and see if you get a true statement.

  2(-4) -8 = -15

  -8 -8 = -15 . . . . . . . false

-4 is <em>not a solution</em> to the equation

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