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3 years ago

A train ticket cost $14 .Don paid with $20 bill .How much money should he get back

Mathematics

2 answers:

Vitek1552 [10]3 years ago

6 0

Answer:

Step-by-step explanation:

He would get 6 back because 20-14=6

Crazy boy [7]3 years ago

3 0

Answer:

Step-by-step explanation:

$20-$14=$6

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In a psychology class, 28 students have a mean score of 83.6 on a test. Then 25 more students take the test and their mean score

GalinKa [24]

Answer:

The new mean would be given by:

$\bar X_f = \frac{\sum_{i=1}^n X +X_1}{28+25}$

And replacing we got:

$\bar X_f = \frac{2340.8+ 1720}{28+25}= 76.6$

Step-by-step explanation:

We know that the original mean from the 28 students is given by:

$\bar X= \frac{\sum_{i=1}^{28} X_i}{28}= 83.6$

The sum of the values is:

$\sum_{i=1}^{28} X_i = 28*83.6 =2340.8$

And now we know that the new mean is 68.8 with the 25 new people so then the new mean would be given by:

$\bar X_1 = \frac{\sum_{i=1}^{25} X_i}{25} = 68.8$

The sum of the values is:

$\sum_{i=1}^{25} X_i = 25*68.8 =1720$

The new mean would be given by:

$\bar X_f = \frac{\sum_{i=1}^n X +X_1}{28+25}$

And replacing we got:

$\bar X_f = \frac{2340.8+ 1720}{28+25}= 76.6$

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Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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