Alright 3 hours =315 because u add up both miles so per hour they move 105miles closer to each other so now we need to figure out how to get an extra 45 miles

anwser 3hours and 26.08695652173913 min

5 0

4 years ago

Suppose your statistics professor reports test grades as z-scores, and you got a score of 2.492.49 on an exam. a) Write a sent

kolezko [41]

Answer:

a) Option C) The score was 2.49 standard deviations higher than the mean score in the class.

b) 2.3%

Step-by-step explanation:

a) We are given that the distribution of test grades is a bell shaped distribution that is a normal distribution.

Formula:

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

$\displaystyle\frac{x-\mu}{\sigma} = 2.49\\\\x - \mu = 2.49\sigma\\x = \mu + 2.49\sigma$

Option C) The score was 2.49 standard deviations higher than the mean score in the class.

b) The z-score for a particular score is -2.

We have to evaluate

P(z < -2)

Calculating the value from normal z-table.

$P(z < -2) = 0.023$

Thus, 2.3% of of the class scored lower than my friend.

6 0

3 years ago

I need help with these four

Kazeer [188]

Answer:

True, b), c), b)

Step-by-step explanation:

True

b) sin = opposite/hypotenuse

Cos A = 0.1908
A = arccos 0.1908
A = 79° ⇒ Option c)

tan A = 16/19
A = arctan 16/19
A = 40° ⇒ Option b)

8 0

3 years ago

Bring the help!!!!!!!!!!!!!!!!!

matrenka [14]

The answer to the problem is -8.58.

8 0

3 years ago