Correct answer gets brainlest

Mathematics

2 answers:

BlackZzzverrR [31]3 years ago

6 0

Step-by-step explanation

(s + d + f + g + x) ÷ 5 = 86

so (s + d + f + g + x) = 430

Now we need to find ?

(s + d + f + g + x + ?) = something that when ÷ by 6 should equal 87

ANSWER : 92 ~ Correct!

murzikaleks [220]3 years ago

3 0

Answer: She needs to score at least a 98 on the sixth quiz to raise her average to at least 88.

Step-by-step explanation:

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Suppose that the lifetime of tv tubes are normally distributed with a standard deviation of 1.1 years. Suppose that exactly 20%

IrinaK [193]

Answer:

4.924 years

Step-by-step explanation:

Lets denote X the lifetime of a tv tube (In years). X has distribution $N(\mu, 1.1)$ , with $\mu$ unknown.

We know that P(X < 4) = 0.2. Using this data, we can find the value of $\mu$ throught standarization.

Lets call $Z = \frac{X - \mu}{1.1}$ the standarization of X. Z has distribution N(0,1), and its cummulative function, $\phi$ is tabulated. The values of $\phi$ can be found in the attached file.

$P(X < 4) = P(\frac{X - \mu}{1.1} < \frac{4 - \mu}{1.1}) = P(Z < \frac{4 - \mu}{1.1}) = \phi(\frac{4 - \mu}{1.1}) = 0.2$

The value q such that $\phi (q) = 0.2$ doesnt appear on the table. We can find it by using the symmetry of the normal density function. The opposite of q, -q must verify that $\phi(-q) = 0.8$ , hence -q must be equal to 0.84. Thus, q = -0.84