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OverLord2011 [107]
3 years ago
9

Help me to take this

Mathematics
1 answer:
ryzh [129]3 years ago
6 0

Step-by-step explanation:

\int \bigg( -  \frac{2}{7}  {x}^{3}  - 4 {x}^{4}  - 2x \bigg)dx \\  \\    = -  \frac{2}{7}\int    {x}^{3}dx  - 4 \int {x}^{4}dx  - 2\int x dx  \\ \\  =  -  \frac{2}{7}   \times \frac{ {x}^{4} }{4}  - 4 \times  \frac{ {x}^{5} }{5}  - 2 \times  \frac{ {x}^{2} }{2}  + c \\  \\  =  -  \frac{{x}^{4} }{14}    -  \frac{4}{5}  {x}^{5}  -  {x}^{2}  + c \\

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IQ scores are known to be normally distributed. The mean IQ score is 100 and the standard deviation is 15. The top 25% of the po
aev [14]

Answer:

110

Step-by-step explanation:

We have been given that the mean IQ score is 100 and the standard deviation is 15.

We will use normal distribution table to solve our given problem.

The top 25% of the population will represent scores greater than 75%.      

The z-score corresponding to data greater than 75% is 0.6745.

Upon substituting our given values in z-score formula, we will get:

z=\frac{x-\mu}{\sigma}

0.6745=\frac{x-100}{15}

0.6745*15=\frac{x-100}{15}*15

10.1175=x-100

10.1175+100=x-100+100

110.1175=x  

Therefore, the top 25% of the population (ranked by IQ score) have IQ’s above 110.

3 0
3 years ago
My little sister, Savannah, is three years old and has a piggy bank
Diano4ka-milaya [45]
10•3=30 cents 30,60,80,1.30,1.60 she will go past 1.50
6 0
3 years ago
Read 2 more answers
2. The data set below records the length of comedy movies. Find the MAD
Naddika [18.5K]

Answer:The mean absolute deviation of a set of data is the average distance ... *find the distance between each data value and the mean. ... 5: The table shows the running time in minutes of two kinds of movies. ... Comedy. Drama. 90 95 88 100 98. 115 120 150 135 144. Mean = ... Round to the nearest hundredth.

Step-by-step explanation:

HOPE THIS HELPS

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Twice the sum of -4 and a number is the same as the number decreased by 7/2
White raven [17]

2.(-4 + x) = x - 7/2

-8 + 2x = x - 7/2

2x - x = -7/2 + 8

x = 9/2

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