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Shkiper50 [21]
3 years ago
11

You need a 25% alcohol solution. On hand, you have a 45 mL of a 15% alcohol mixture. You also have 30% alcohol mixture. How much

of the 30% mixture will you need to add to obtain the desired solution?
Mathematics
1 answer:
pogonyaev3 years ago
3 0

A 75% alcohol concentration mixture of water and alcohol and was made by mixing 30 ml of pure alcohol with 150 ml of original mixture

Maths
How much pure alcohol has to be added to 400ml of a solution containing 15% alcohol to 

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A dairy scientist is testing a new feed additive. She chooses 13 cows at random from a large population of cows. She randomly as
mina [271]

Answer:

Step-by-step explanation:

Given that a dairy scientist is testing a new feed additive. She chooses 13 cows at random from a large population of cows. She randomly assigns nold = 8 to get the old diet, and nnew = 5 to get the new diet including the additive.

From the data given we get the following

           N       Mean      StDev     SE Mean

Sample   1    8           43       5.1824 1.832

Sample   2   5           73     21.0832 9.429

df = 11

Std dev for difference = 13.3689

a) Yes the two are independent.  The two sets of cows randomly chosen are definitely independent. Paired means equal number should be there and homogeneous conditions should be maintained.

b) Enclosed

c) Comparison of two means is the test recommended here.  Because independent samples are used.\

d) Test statistic= -3.1233

(because of unequal variances we use that method)

95% confidence interval =  ( -56.6676 , -3.3324 )

p value <0.05 our alpha

So reject null hypothesis.

The two means are statistically significantly different.

3 0
3 years ago
0.08 is 10 times grater than
solong [7]
Subtract the minimum data value from the maximum data value to find the data range,so in this case yur data range is 

10 - 0.08 = 9.92
so yur answer is 9.92
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2. The water level of a river was measured each day during a two-week period. The
vampirchik [111]

Step-by-step explanation:

day during a two-week period. The

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7 0
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I believe the answer you are looking for is 2 angles
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3 years ago
Which equation would you use to find the distance between point A and point H?
andreev551 [17]
B -4-1 because the one is positive and the 4 is negative
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