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ikadub [295]
2 years ago
13

50 students each did a mathematics test. the mean score for these 50 students was 8.4. there were 30 boys. the mean score for th

ese bots were 8.25. workout the mean score for the girls.
Mathematics
1 answer:
Angelina_Jolie [31]2 years ago
7 0

[(30 x 8,25) + (20 x n)] / 50 = 8,4

247,5 + 20 x n = 420

n = (420 - 247,5) : 20

n = 8,625

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3/4 of 22 as a mixed number in its simplest form
user100 [1]

Answer:

3+2times 4=34

Step-by-step explanation:

5 0
2 years ago
A "principal square root" is always...
vladimir1956 [14]

Really none of the above.  

A principal square root of a real number is a positive real number (or a positive real number times i, if you're up to complex numbers, but let's assume not.)  It's not necessarily a positive integer, √2 being the obvious example.

Is √2 a positive fraction?   We can write it as √2 / 1 so I suppose it is.  It's certainly not a rational number.  Even if we grant irrationals as fractions surely √0=0 isn't a positive fraction.  So "always" isn't correct.

I'd go with none of the above, but if I had to choose I'd choose D.


3 0
3 years ago
convert the measurement 5,000 yards (There are 1.09 yards in a meter.) A. 4000 m B. 6000 m C. 5 km D. 500 m
Ray Of Light [21]

Answer:

A

Step-by-step explanation:

If 1.09 yards is in a meter, then there are 4572 meters in 5000 feet.

A is the correct answer. Hope this helps!

3 0
2 years ago
The manager of a sporting goods store ordered 256 packages of football cards to be shipped to the store there are 24 cards in ea
Allisa [31]
He ordered 6144 football cards
7 0
3 years ago
Read 2 more answers
eric is 70 inches tall pablo is as half as tall as eric annette is 5.25 inches taller than pablo how tall is annette
Kazeer [188]

Answer:

40.25 inches

Step-by-step explanation:

Following what the problem mentions:

"eric is 70 inches tall"

Eric=70in

"pablo is as half as tall as eric"

pablo=\frac{Eric}{2}

pablo=\frac{70in}{2}=35in

and "annette is 5.25 inches taller than pablo"

annete=pablo+5.25in

annette=35in+5.25in =40.45in

Annette is 40.25 inches tall

7 0
2 years ago
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