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Butoxors [25]
3 years ago
15

A car manufacturer crash tests a certain model of car and measures the impact force. The test and model in question produce impa

ct forces that are normally distributed with a mean of 303030 metric tons and a standard deviation of 1.51.51, point, 5 metric tons. Suppose that the manufacturer tests a random sample of 444 cars and calculates the sample mean impact force.
Mathematics
2 answers:
pychu [463]3 years ago
8 0

Answer:

30

Step-by-step explanation:

Given :

Mean, m = 30 metric tons

Standard deviation (s) = 1.5 metric ton

Sample size, n = 4

Since the impact force in the test model is normally distributed, the shape of the sampling distribution will also be approximately normal with a mean equal to the mean of the test model.

Hence, the sample mean impact force will be equal to the population mean.

Therefore, sample mean = 30 ; population mean = 30

faltersainse [42]3 years ago
3 0

Answer:

  _

P(x >30.75)≈0.16

Step-by-step explanation:

just had this question on khan academy.

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valkas [14]
Chang 3/5 to 6/10 than add 6/10+9/10 the top numbers together and that would be 15/10. than / by 5 witch = 3/2
8 0
3 years ago
Help me with number 1. Thank you!
Brums [2.3K]
   4k - 3 = 2k + 5
       + 3          + 3
-------------------------
   4k  =  2k  +  8
  -2k    - 2k                          
-------------------------
   2k = 8
 ------ -----
    2     2
 
    k = 4

You can also do it this way:

   4k - 3 = 2k + 5
 - 4k       - 4k
------------------------
  -3 = -2k + 5
  -5            - 5
------------------------
 -8 = -2k
-----  ------
 -2     -2

4 = k

As you can see, you will get the same answer either way you figure it out :)
6 0
4 years ago
(1/7x-1/2y)*(0,14-0,7x in 2 y)
Illusion [34]

3 is the correct ansawr


6 0
3 years ago
An arithmetic sequence has this recursive formula:
ankoles [38]

Hello!


The recursive rule for an arithmetic sequence: a_{n} = a_{n-1} + d.

The explicit rule for an arithmetic sequence: a_{n}=a_{1} +d(n-1).


a_{n} is the value you are trying to find, or simply the answer. :)

d is the common difference of the sequence.

a_{1} is the first term of the sequence.


Given, a_{1} = 8 and a_{n}=a_{n-1} - 6...

The common difference is -6, and the first term is 8.


Plug these values into the explicit rule for an arithmetic sequence, you get:

a_{n}=8+(-6)(n-1).


Therefore, the answer is A, a_{n}=8+(n-1)(-6).


If you wondered why, a_{n}=8+(-6)(n-1) is equal to a_{n}=8+(n-1)(-6), the Commutative Property of Multiplication states that when two numbers are multiplied together, the answer is the same regardless of the order of the numbers, which makes a_{n}=8+(-6)(n-1) and a_{n}=8+(n-1)(-6) equal to each other.

4 0
4 years ago
Read 2 more answers
Point: (3,−4)
Valentin [98]

Answer:

We need to turn the equation into y=mx+b form.

So the equation would be:

y=-1(3)+-4

Step-by-step explanation:

5 0
3 years ago
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