Which statement is false about the line whose equation is y=-2x-5?

gladu [14]

distribution (if we are talking about algebraic properties)

5 0

3 years ago

The number of cigarettes smoked per day by adults forms a normal distribution. The average number of cigarettes smoked per day i

Mariana [72]

Answer:

17.3 cigarettes represent the 35th percentile

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

$\mu = 20, \sigma = 7$

What number of cigarettes would represent the 35th percentile?

This is the value of X when Z has a pvalue of 0.35. So it is X when Z = -0.385.

So

$Z = \frac{X - \mu}{\sigma}$

$-0.385 = \frac{X - 20}{7}$

$X - 20 = -0.385*7$

$X = 17.3$

17.3 cigarettes represent the 35th percentile

6 0

3 years ago

Assuming the probability of a single sample testing positive is 0.15, find the probability of a positive result for two samples

Grace [21]

Answer:

$P(Positive\ Mixture) = 0.2775$

The probability is not low

Step-by-step explanation:

Given

$P(Single\ Positive) = 0.15$

$n = 2$

Required

$P(Positive\ Mixture)$

First, we calculate the probability of single negative using the complement rule

$P(Single\ Negative) = 1 - P(Single\ Positive)$

$P(Single\ Negative) = 1 - 0.15$

$P(Single\ Negative) = 0.85$

$P(Positive\ Mixture)$ is calculated using:

$P(Positive\ Mixture) = 1 - P(All\ Negative)$ ---- i.e. complement rule

So, we have:

$P(Positive\ Mixture) = 1 - 0.85^2$

$P(Positive\ Mixture) = 1 - 0.7225$

$P(Positive\ Mixture) = 0.2775$

<em>Probabilities less than 0.05 are considered low.</em>

<em>So, we can consider that the probability is not low because 0.2775 > 0.05</em>

6 0

3 years ago

4.3 + 2.4 + 0.8 + 6.7 =

umka2103 [35]

14.2 xxx hope this helps :)

4 0

3 years ago

Read 2 more answers

Tristan got in the elevator at level 2. He then went 5 floors down towards the parking garage. Finally he went back up 6 floors

yan [13]

Answer: 1st floor

Step-by-step explanation:

From the descriprion Tristan got in the elevator on the second floor (2nd). He went five floors down toward the Parking garage this meant at the end of the journey he was on the seventh (7th) floor of the building. He went back of six (6) More floors before existing the elevator this would put Tristan on first (1st) floor of the building.

7 0

3 years ago