7Answer:
Step-by-step explanation:
The answer is 5.5
The standard deviation (sd or σ) of the sample mean difference is:
sd = √(sd₁²/n₁ + sd₂²/n₂)
For the population A:
sd₁ = 17.6
n₁ = 25
For the population B:
sd₂ = 21.2
n₂ = 30
Hence:
sd = √(sd₁²/n₁ + sd₂²/n₂)
= √(17.6²/20 + 21.2²/30)
= √(309.76/20 + 449.44/30)
= √(15.49 + 14.98)
= √(30.47)
= 5.5
0.080
can be that because you add an extra zero so the number is smaller
The distributive property of multiplication over addition can be used when you multiply a number by a sum. For example, suppose you want to multiply 3 by the sum of 10 + 2. 3(10 + 2) = ? According to this property, you can add the numbers and then multiply by 3.
Answer:
Expression 1 equals, 25.
To make the second expression 19, you add parenthesis
The distance in scientific notation would be 5.8* 10^7.
The diameter of a human hair in scientific notation would be 2.5* 10^-3
Columbus, Ohio: 8.23* 10^5
United States 3.19*10^8
319,000,000/823,000 = 387.606318
So, it's about 387 times larger
