2x - 3y=-6 -5x - 9y = 15 Elimination with multiplication

The box plot shows ages of randomly sampled attendees at two different movies. Check all statements that apply to Movie A.

deff fn [24]

Answer:

B)

Step-by-step explanation:

5 0

2 years ago

Read 2 more answers

Match each operation involving f(x) and g(x) to its answer.

galben [10]

F(x)=1-x² and g(x)=√(11-4x)

(g+f)(2)=>

1-(2)²+√(11-4(2))

=√3-3

(f/g)(-1)

(1-(-1)²)/(√(11-4(-1))

=0

(g-f)(-1)

√(11-4*-1)-(1-(-1)²

=√15

(g×f)(2)

1-(2)²×√(11-4(2))

-3√3

8 0

3 years ago

A research scientist wants to know how many times per hour a certain strand of bacteria reproduces. The mean is found to be 13.6

dimaraw [331]

Answer:

The confidence interval is $13.4< \mu < 13.8$

Step-by-step explanation:

From the question we are told that

The sample mean is $\= x = 13.6$

The standard deviation is $\sigma = 1.9$

The sample size is $n = 189$

given that the confidence level is 85% then the level of significance is mathematically represented as

$\alpha = (100 - 85 )\%$

$\alpha = 0.15$

Next we obtain the critical value of $\frac{\alpha }{2}$ from the normal distribution table the value is

$Z_{\frac{\alpha }{2} } = 1.44$

Generally the margin of error is mathematically represented as

$E = Z_{\frac{\alpha }{2} } * \frac{\sigma}{\sqrt{n} }$

=> $E = 1.44* \frac{1.9}{\sqrt{189} }$

=> $E = 0.1990$

The 85% confidence interval is mathematically represented as

$\= x - E < \mu$

=> $13.6- 0.1990 < \mu < 13.6+ 0.1990$

=> $13.4< \mu < 13.8$

5 0

3 years ago

Which of the following describes the parabola with the equation y=4x^2-12x+9

mixer [17]

There are no choices but when graphed the parabola will look like an upside-down "U". like this: ∩

4 0

3 years ago

Goddesboi this one! what’s the answer? thanks ^^

xz_007 [3.2K]

Answer:

C) 20.97 AED

Step-by-step explanation:

To find the expected value, E(X), or mean μ of a discrete random variable X, simply multiply each value of the random variable by its probability and add the products. The formula is given as $\displaystyle E(X)=\mu=\sum xP(x)$ .

Here, x represents values of the random variable X, $P(x)$ represents the corresponding probability, and symbol $\displaystyle \sum$ represents the sum of all products $xP(x)$ . Here we use the symbol $\mu$ for the mean because it is a parameter. It represents the mean of a population.

In this case, the expected value of the ticket is $\displaystyle E(X)=\mu=\sum xP(x)=12(0.08)+18(0.15)+20(0.31)+22(0.08)+24(0.15)+25(0.23)=20.97$

This means that Ahmad can expect to win 20.97 AED for the ticket.

7 0

2 years ago