Graph x > -3. Please help soon!!! Thanks!!!!!

Mathematics

1 answer:

Kay [80]3 years ago

6 0

Answer: ok....

Step-by-step explanation:

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Sarah is taking a test. The test is designed to produce an overall mean score of 85 with a standard deviation of 5 for all test

Arturiano [62]

Answer:

Option D)

The area below the standardized test score is 0.8413

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 85

Standard Deviation, σ = 5

We are given that the distribution of score is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

P(score is below 90)

$P( x < 90) = P( z < \displaystyle\frac{90 - 85}{5}) = P(z < 1)$

Calculation the value from standard normal z table, we have,

$P(x < 90) =0.8413 = 84.13\%$

Thus, the correct answer is

Option D)

The area below the standardized test score is 0.8413

4 0

3 years ago

a manufacturer inspects 800 personal video players and finds that 798 of them have no defects. what is the experimental probabil

Nata [24]

$Given:\\Number \; of \; Video \; Players \; with \; no \; de\dot{f}ect=798\\Total \; Number \; of \; video \; Players = 800$ $Let \; A \; be \; an \; Event \; that \; a \; video \; player \; chosen \\\; at \; random \; has \; no \; de\dot{f}ect\\P(A) \; be \; the \; experimental \; probability\\ of \; event \; A \; to \; happen.\\\\The \; formula \; is \; below:\\P(A) \; = \; \frac{Number \; of \; video \; players \; with \; no \; de\dot{f}ects }{Total \; number \; of \; video \; players}\\\\P(A)=798 \div 800 =0.9975=99.75 \%$