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lubasha [3.4K]
3 years ago
10

81 + 9 = 9+81 true or false

Mathematics
1 answer:
alina1380 [7]3 years ago
7 0

Answer:

true

----------------------------------

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Answer:

2. and 4.

Step-by-step explanation:

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What is the constant of proportionality in the table below?
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Its B because i divided 38.25 by 3 and it gave me and answer of 12.75 per hour

6 0
3 years ago
Evaluate the expression when <br><br> b=4 and x=-7.<br><br> b-5x
yaroslaw [1]

Answer:

39

Step-by-step explanation:

b - 5x = 4 - 5(-7) = 4 - (-35) = 4 + 35 = 39

7 0
2 years ago
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he blood platelet counts of a group of women have a​ bell-shaped distribution with a mean of 247.3 and a standard deviation of 6
Ulleksa [173]

Answer:

The approximate percentage of women with platelet counts within 3 standard deviations of the​ mean is 99.7%.

Step-by-step explanation:

We are given that the blood platelet counts of a group of women have a​ bell-shaped distribution with a mean of 247.3 and a standard deviation of 60.7.

Let X = <em>t</em><u><em>he blood platelet counts of a group of women</em></u>

The z-score probability distribution for the normal distribution is given by;

                                Z  =  \frac{X-\mu}{\sigma}  ~ N(0,1)

where, \mu = population mean = 247.3

           \sigma = standard deviation = 60.7

Now, according to the empirical rule;

  • 68% of the data values lie within one standard deviation of the mean.
  • 95% of the data values lie within two standard deviations of the mean.
  • 99.7% of the data values lie within three standard deviations of the mean.

Since it is stated that we have to calculate the approximate percentage of women with platelet counts within 3 standard deviations of the​ mean, or between 65.2 and 429.4, i.e;

         z-score for 65.2 =  \frac{X-\mu}{\sigma}

                                     =  \frac{65.2-247.3}{60.7}  = -3

         z-score for 429.4 =  \frac{X-\mu}{\sigma}

                                       =  \frac{429.4-247.3}{60.7}  = 3

So, it means that the approximate percentage of women with platelet counts within 3 standard deviations of the​ mean is 99.7%.

4 0
3 years ago
Which of the following is the expansion of (2m - n)7?
WINSTONCH [101]
-7n + 14m

Enjoy !! :)
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3 years ago
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