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3 years ago

Can someone give me the steps to solving this equation? 3^x = 81

1 answer:

5 0

Do 81/3=27/3=9/3=3, So you see the answer is 3^4, I don't know if that's the official way to solve it but it works.

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The playing time X of jazz CDs has the normal distribution with mean 52 and standard deviation 7; N(52, 7).

natita [175]

Answer:

68% of jazz CDs play between 45 and 59 minutes.

Step-by-step explanation:

The correct question is: The playing time X of jazz CDs has the normal distribution with mean 52 and standard deviation 7; N(52, 7).

According to the 68-95-99.7 rule, what percentage of jazz CDs play between 45 and 59 minutes?

Let X = playing time of jazz CDs

SO, X ~ Normal( $\mu=52, \sigma^{2} =7$ )

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

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

Now, according to the 68-95-99.7 rule, it is stated that;

68% of the data values lie within one standard deviation points from the mean.

95% of the data values lie within two standard deviation points from the mean.

99.7% of the data values lie within three standard deviation points from the mean.

Here, we have to find the percentage of jazz CDs play between 45 and 59 minutes;

For 45 minutes, z-score is = $\frac{45-52}{7}$ = -1

For 59 minutes, z-score is = $\frac{59-52}{7}$ = 1

This means that our data values lie within 1 standard deviation points, so it is stated that 68% of jazz CDs play between 45 and 59 minutes.

6 0

3 years ago

Please Help 30 Points

Virty [35]

Answer:

Step-by-step explanation:

5 0

2 years ago

Every US. Citizen has a 9 digit social security number. The first 3 digits are a geographic code, the next two digits are determ

Ilia_Sergeevich [38]

Probability of success =

   (number of possibilities that would be considered successful)
divided by
   (total number of different possible outcomes) .

Total number of different possible outcomes =

   total number of different possible values of the last 2 digits

   = the quantity of numbers from 00 to 99

   = 100 of them .

The number of possibilities that will match your age = only 1 .

Probability that the last 2 digits match your age = 1/100 = 0.01 = 1 % .

6 0

3 years ago

Evaluate j/k -0.2k when j =25 and k = 5

denis-greek [22]

When you have an equation that has variables and you know the value of those variables, just plug it it. So plugging the vaules we get
$\frac{25}{5}-\frac{1}{5}5$
Just evaluating we get 4

5 0

3 years ago

Read 2 more answers

if there are 2040 seats in a section of a stadium, 20 seats in the first row, and 4 more seats in each row, how many rows are th

Lorico [155]

2040 = n/2(20+(n-1)4)

4080 = n(20+4n-4)

4080= 20n +4n^2 -4n

1020 = 4n + n^2

n^2 +4n -1020 =0

use common formula (can't write out so just look at answers. sorry)

which gives answers of n=-34 and n=30. since n can only be positive, n=30 so there are 30 rows. I liked that challenge