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umka2103 [35]
3 years ago
12

The standard deviation of a sample taken from population A is 17.6 for a sample of 25. The standard deviation of a sample taken

from population B is 21.2 for a sample of 30.
Mathematics
1 answer:
agasfer [191]3 years ago
3 0
33.3..........................................
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4. Estimate the sum of 9.327 + 5.72 + 4.132 to one decimal place.18.729
ziro4ka [17]
The sum for those numbers is 19.179 NOT 18.729. HOWEVER the Estimation of the sum and the answer for this question is 19.2 because the decimal place you are finding has a number to its right that is greater to that decimal place so you add the one to the decimal place you are finding.
6 0
4 years ago
Read 2 more answers
Simplify completely X2 + 4x - 45 ÷ x2 + 10x + 9 and find the restrictions on the variable​
svetoff [14.1K]

Answer: (x-5)/(x+1) and x cannot equal -1 because the denominator can't be zero.

Step-by-step explanation:

Factor the numerator:

(x+9)(x-5)

Factor the denominator:

(x+1)(x+9)

So you have

(x+9)(x-5)/(x+1)(x+9); see that you can cross out the (x+9) in both the numerator and denominator?

You're left with (x-5)/(x+1)

The only number that is restricted is -1, because that would make the denominator zero, which is a no no!!

7 0
3 years ago
What is the value of h(−2)h(−2) when h(x)=3x+1h(x)=3x+1
alex41 [277]
I hope this helps you



x= -2


h (-2)=3. (-2)+1



h (-2)= -6+1


h (-2)= -5
7 0
3 years ago
Sheri invests $10,000 in a simple interest account. What interest rate must the account pay so she earns $2,000 in 5 years? * O
IrinaVladis [17]

Answer:

4%

Step-by-step explanation:

A=P(1+rt)

A=10,000(1+.04*5)

12,000

The total amount accrued, principal plus interest, from simple interest on a principal of $10,000.00 at a rate of 4% per year for 5 years is $12,000.00.

3 0
3 years ago
Line JK bisects line LM at point J. Find JM if LJ=23 centimeters
vlada-n [284]
Ling JM is also 23 centimeters because line LJ and JM are a line but broken into two segments
4 0
3 years ago
Read 2 more answers
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