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BartSMP [9]
3 years ago
14

A train traveled 350km in 2.5h. what was the average speed of the train?

Mathematics
1 answer:
omeli [17]3 years ago
4 0
So the train traveled 350 km in 2.5 h let's do the work together what do you think we start off with we can divide 350 by 2.5 tell me what your answer is when you've done the division
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I need to know the amount of Iodine -131 remaining after 72 days
jenyasd209 [6]

Answer:

131 remaining after 72 days

Step-by-step explanation:


4 0
3 years ago
What is 15 times 7/5 compared to 15 equal?
Kaylis [27]

Answer:

I do not know

Step-by-step explanation:

4 0
2 years ago
A normal distribution has a standard deviation equal to 39. What is the mean of this normal distribution if the probability of s
Naily [24]

Answer:

The mean is \mu = 131

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:

\sigma = 39

What is the mean of this normal distribution if the probability of scoring above x = 209 is 0.0228?

This means that when X = 209, Z has a pvalue of 1-0.0228 = 0.9772. So when X = 209, Z = 2.

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

2 = \frac{209 - \mu}{39}

209 - \mu = 2*39

\mu = 209 - 78

\mu = 131

The mean is \mu = 131

7 0
2 years ago
A shirt originally cost $36.24, but it is on sale for $30.80. What is the percentage decrease of the price of the shirt? If nece
KiRa [710]
To work out the decrease, do original amount - new amount and then take that answer and divide it by the original amount, and then multiply by 100.

So you would do:

36.24 - 30.80 = 5.44
5.44 ÷ 36.24 × 100 = 15% to the nearest percent.  

6 0
3 years ago
If you have a decimal answer, round to the nearest tenth!<br> 2/3c−4=8
Alenkasestr [34]

Answer:

= 18

Step-by-step explanation:

7 0
2 years ago
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