I don't understand this at all

If i make 1.5 million dollars per day, plus an extra 250k interest every 31 hours, how much money do i make per day?

lidiya [134]

Answer: Alot

Step-by-step explanation:

4 0

3 years ago

What is the average rate of change for f(z) = -2z^2 - 12z -19 over the interval [ -4, -2 ]?

marusya05 [52]

Answer:

Average rate of change = 0

Step-by-step explanation:

f(z) = -2z^2 - 12z - 19

a = -4 and b = -2

[f(b) - f(a)] / (b-a)

[-2(-2)^2 - 12(-2) -19] - [-2(-4)^2-12(-4)-19] / (-2 -(-4))

(-8+24-19) - (-32+48-19) / 2

(-8+24-19+32-48+19) / 2 = 0/2

6 0

3 years ago

A high-tech company wants to estimate the mean number of years of college education its employees have completed. A sample of 15

valentinak56 [21]

Answer:

$4 - 2.14 \frac{0.7}{\sqrt{15}}=3.61$

$4 + 2.14 \frac{0.7}{\sqrt{15}}=4.39$

The 95% confidence interval is given by (3.61;4.39)

Step-by-step explanation:

Notation and definitions

n=15 represent the sample size

$\bar X=4$ represent the sample mean

$s=0.7$ represent the sample standard deviation

m represent the margin of error

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Calculate the critical value tc

In order to find the critical value is important to mention that we don't know about the population standard deviation, so on this case we need to use the t distribution. Since our interval is at 95% of confidence, our significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . The degrees of freedom are given by: