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ikadub [295]
3 years ago
15

Help me on this plz

Mathematics
1 answer:
Andrews [41]3 years ago
7 0

Answer: $467.21

Step-by-step explanation:

8% of 600 = 48

600 - 48 = 552

8% of 552 = 44.16

552 - 44.16 = 507.84

8% of 507.84 = 40.6272

8% of 507.84 ≈ 40.63

507.84 - 40.63 = 467.21

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4. IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. In a
borishaifa [10]

675 people will have score between 85 and 120

Step-by-step explanation:

Given

Mean = 100

SD = 15

If we have to find percentage of score between two values we have to find the z-score for both values and then area under the curve for both values

z-score is given by:

for a value x:

z-score = \frac{x-mean}{SD}

So,

For 85:

z-score = z_1 = \frac{85-mean}{SD}\\ = \frac{85-100}{15}\\=\frac{-15}{15}\\=-1

z-score = z_2 = \frac{120-mean}{SD}\\ = \frac{120-100}{15}\\=\frac{20}{15}\\=1.3333

Now we have to find the area under the curve for both values of z-score. z-score tables are used for this purpose.

So,

For z1 : 0.1587

For z2: 0.9082

The area between z11 and z2:

z_2-z_1 = 0.9082-0.1587=0.7495

So the probability of score between 85 and 120 is 0.7495

As the sample is of 900 people, the people with scores between 85 and 120 will be:

900*0.7495 = 674.55 people

Rounding off to nearest whole number

675 people will have score between 85 and 120

Keywords: Probability, SD

Learn more about probability at:

  • brainly.com/question/10978510
  • brainly.com/question/11007026

#LearnwithBrainly

4 0
4 years ago
How many seconds are in 100,000,000 minutes?
bekas [8.4K]

So, dimensional analysis will help with this


100000000min *\frac{60sec}{1min}=6000000000 \\or\\6\times10^9

Hope this helps!

8 0
4 years ago
Read 2 more answers
Bailey tossed a coin 10 times. The results were 7 heads and 3 tails.
Veronika [31]
The experimental probability of tossing tails is 3/10
7 0
2 years ago
A bag contains blue, red, green, and black marbles. If there are 236 marbles in the bag and 25% of them are blue how many marble
svp [43]

236*0.25

Answer= 59 blue

4 0
3 years ago
Read 2 more answers
9x-y=5<br> 7x-6y=5<br> Solve the system by the substitution method
qwelly [4]
  9x - y = 5
7x - 6y = 5

Solve both equations for one variable. I'll solve for y.

9x - y = 5            Subtract 9x from both sides
      -y = -9x + 5   Divide both sides by -1
       y = 9x - 5

7x - 6y = 5   Subtract 7x from both sides
      -6y = -7x + 5   Divide both sides by -6
          y = \frac{7}{6}x - \frac{5}{6}

Since both equations equal y, you can set them equal to each other and solve for x.

9x - 5 =<span> \frac{7}{6}x - \frac{5}{6}   Multiply both sides by 6 to eliminate the fractions
54x - 30 = 7x - 5    Subtract 7x from both sides
47x - 30 = -5          Add 30 to both sides
       47x = 25          Divide both sides by 47
           x = </span>\frac{25}{47}

Now, plug that x-value into the x of either equation. I'll plug it into 9x - y = 5.

9x - y = 5   Plug in the x-value
9(<span>\frac{25}{47}) - y = 5   Multiply
</span>\frac{225}{47} - y = 5   Subtract <span>\frac{225}{47} from both sides
</span>-y = <span>0.21276595744 (I had to convert it to a decimal)   Divide both sides by -1
 y = -</span><span>0.21276595744

So, the answer to the system is (</span>0.53191489361, -<span>0.21276595744)</span>
8 0
4 years ago
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