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tigry1 [53]
3 years ago
13

How long would it take for a car to travel 200 km if it has an average speed of 55 km/hr?

Mathematics
1 answer:
Vesna [10]3 years ago
7 0

Answer:

7,5 hours

Step-by-step explanation:

You might be interested in
The points obtained by students of a class in a test are normally distributed with a mean of 60 points and a standard deviation
Paraphin [41]

Answer:

0.13% of students have scored less than 45 points

Step-by-step explanation:

Problems of normally distributed samples can be 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 = 60, \sigma = 5

About what percent of students have scored less than 45 points?

This is the pvalue of Z when X = 45. So

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

Z = \frac{45 - 60}{5}

Z = -3

Z = -3 has a pvalue of 0.0013

0.13% of students have scored less than 45 points

3 0
3 years ago
emliy is thinking of a number which she calls n she find 1/4 of the number and then subtracts 3. write an expressions that repre
olganol [36]

Answer:

1/4 n - 3.

Hope this helps, sorry if it doesn't.

3 0
2 years ago
Tahmar knows the formula for simple interest is I = Prt, where I represents the simple interest on an amount of money, P, for t
vichka [17]
I=prt
20=p X .05 X 5
20 = p X .25
20/.25 = p
80 = p
She started with $80
4 0
3 years ago
A set of numbers is shown below:
Snezhnost [94]
2 because 2(2) + 3 = 7
6 0
3 years ago
Read 2 more answers
Someone plz help on # 15 (idk what to do) :/
aleksklad [387]

Answer:

2x-5= -20

move -5 to the other side

sign changes from -5 to 5

2x-5+5= -20+5

2x= -15

divide by 2 for both sides

2x/2= -15/2

cross out 2 and 2, divide by 2 and 2 and then becomes x

x= -15/2

4 0
3 years ago
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