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Gennadij [26K]
2 years ago
11

The mean number of words per minute (WPM) read by sixth graders is 86 with a variance of 225. If 44 sixth graders are randomly s

elected, what is the probability that the sample mean would differ from the population mean by less than 3.71 WPM
Mathematics
1 answer:
Dmitry [639]2 years ago
3 0

P(X<=x) = 1 + 5.486 = 6.486

The z-score of the information given is,

z = (x - µ )/ σ

Where,

µ = mean

σ = standard deviation

From the information given,

x = 3.71

µ = 86

σ  = √225 = 15

hence,

z = (3.71 - 86)/15 = -5.486

thus,

P(X<=x) = 1 + 5.486 = 6.486

hence , P(X<=x) = 1 + 5.486 = 6.486

Learn more about variance here brainly.com/question/9304306

#SPJ4

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16) Your salary goes from $8.75 an hour at your present job to $16.50 an hour in your new job. What is
Agata [3.3K]

Answer:

The percent change in salary from one job to the next is 88.57%.

Step-by-step explanation:

The previous salary of per hour =  $8.75 per hour

The current salary of per hour  = $16.50 per hour

Change in the salary rate per hour  =  Current salary  -  Previous Salary

                                                             = $16.50 per hour -  $8.75 per hour

                                                             =$7.75 per hour

⇒The change in the salary per hour rate is $7.75

Now, \textrm{Percentage Change in salary}  = \frac{\textrm{Change in the rate of salary}}{\textrm{Previous Salary}}  \times 100

= \frac{7.75}{8.75}  \times 100 = 88.57

or, the change in salary percentage is 88.57%

Hence, the percent change in salary from one job to the next is 88.57%.

4 0
3 years ago
Four bakers used the following amounts of flour and sugar in their favorite cake recipe. Which bakers use the same flour to suga
eduard

bakers a and d


[6:4 is the same as 3:2]


(hope this helps, if so, please give brainliest x)

7 0
3 years ago
Among all rectangles that have a perimeter of 188, find the dimensions of the one whose area is largest.
ANEK [815]
Always add them all around and then divide the two and you should get the correct answer
4 0
2 years ago
last year, 639 students attended a summer camp. of those who attended this year, 0.5% also attended summer camp last year. about
lawyer [7]

Answer:

First of all, he have to find out what 0.5% of the students is.

Second of all, find out what 0.5 of 100 is. 100 divided by 0.5 is 200.

Third of all, divide 200 from 639. This equals 3.195

Since it is asking about how many, I would go with about 3. After all, you can't have have half of a person, so the decimals shouldn't be added.

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
54. Write the ratio as a fraction in simplest<br>form.<br>56 to 16​
pshichka [43]

Answer:

56/16 = 3.5

Step-by-step explanation:

4 0
3 years ago
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