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2 years ago

7

A telephone call costs $1.50 for the first three minutes, and 20 cents for each additional minute. What is the cost of a nine-mi

nute call, in dollars?

1 answer:

Ad libitum [116K]2 years ago

5 0

Answer:1.50+.20(6)=

1.50+1.20=$2.70

Step-by-step explanation:

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Assume that the random variable X is normally distributed with mean u = 45 and standard deviation o = 14.

larisa86 [58]

Answer:

P(57 < X < 69) = 0.1513

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:

$\mu = 45, \sigma = 14$

Find P(57 < X < 69):

This is the pvalue of Z when X = 69 subtracted by the pvalue of Z when X = 57. So

X = 69

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

$Z = \frac{69 - 45}{14}$

$Z = 1.71$

$Z = 1.71$ has a pvalue of 0.9564

X = 57

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

$Z = \frac{57 - 45}{14}$

$Z = 0.86$

$Z = 0.86$ has a pvalue of 0.8051

0.9564 - 0.8051 = 0.1513

P(57 < X < 69) = 0.1513

4 0

3 years ago

A rectangular park is 150 yards on one side and 125 on the other

nlexa [21]

Area is whatever 125x150 equals

8 0

3 years ago

If a ball is thrown into the air with a velocity of 42 ft/s, its height (in feet) after t seconds is given by y = 42t − 16t2. Fi

Andru [333]

$\bf y=42t-16t^2\implies \left. \cfrac{dy}{dt}=42-32t \right|_{t=1}\implies 42-32\implies 10$

8 0

2 years ago

What is the circumference of the circle if r= 3.5 feet? Use 22/7 for pi

alexdok [17]

Answer:

circumference of circle=2πr

2×22/7×3.5
22

hope it helps.

6 0

2 years ago

Read 2 more answers

Mr. Rodriguez had his students line up in order from shortest to tallest. Tia was exactly in the middle of all the students. Whi

evablogger [386]

Answer:

Median

Step-by-step explanation:

The median value of a distribution is obtained by :

FIRSTLY : Arranging the data in order usually ascending order.

Then the 50th percentile of the data is determined , the value which falls in the 50th percentile is the median of the distribution. The 50th percentile is the exact mid value of the distribution.

This describes the exact same way Tia was chosen in the scenario described above. Hence the measure of the center described is the Median.

3 0

2 years ago