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Gekata [30.6K]
3 years ago
13

There are 80 students in a speech contest. Yesterday, 1/4 of them gave their speeches. Today, 3/5 of the remaining students gave

their speeches. How many students still haven't given their speeches?
Mathematics
1 answer:
expeople1 [14]3 years ago
3 0

Answer:

so 24 is the answer

Step-by-step explanation:

first 1/4 is 20 out of 60

Second, we have to work out one fifth. The easiest way to do this is to divide 60 by five.

60 divided by 5 = 12

(We should know this from our times tables, 5x12=60)

We then times the fifth by three to work out three fifths.

12 x 3 = 36

We can then check this by working out two fifths and checking that both the answers add up to make 60.

We work out two fifths the same way we work out three, timesing by the value for one fifth.

12 x 2 = 24

24 + 36 = 60

So we know that we were correct and our final answer is

3/5 of 60 = 36.

then 24 + 36 = 60

so 24 is the answer

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Answer:

Assuming that this data is used to conduct a hypothesis test to test the manufacturers' claim, the test statistic we an use is:

the paired sample t-test.

Step-by-step explanation:

a) Data and Analysis:

Subject   Before   After

1                 225      215

2                245     240

3                 188      188

4                210       212

5               282       175

6               275      260

7               230      225

8               195      200

9               190       185

b) The paired sample t-test is used to compare the means from the same dataset but at different times (say, one month apart).  It supports the comparison of sample data before and after the data subjects have taken the dietary supplement.  When the t-value is high, it is an evidence that the null hypothesis should be rejected.  The higher value of the t-test, therefore, indicates that there is a large difference between the two sample sets.  On the other hand, a small t-value shows similarity between the two sample sets.

3 0
3 years ago
The MD orders 50mg of an elixir to be given every 12 hours. Available is 125mg/5ml. How much should be administered every 12 hou
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FORMULA

D ( desired dose) x V ( vehicle- tablet or liquid)

H ( dose on hand)

D = Dose ordered

H = dose on hand or dose on container label

V = form and amount in which drug comes ( tablet, capsule, liquid)

D= 50mg H= 125mg V= 5ml

50 x 5

125

250 divided by 125 = 2ml

So, 2ml of elixir is administered every 12 hours :) brainliest pls
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