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ExtremeBDS [4]
4 years ago
5

Suppose that in a particular sample, the mean is 70.07 and the standard deviation is 10.27. what is the z score that corresponds

to a raw score of 80?
Mathematics
1 answer:
kati45 [8]4 years ago
3 0
<span>To find the z score, we need to use the following formula: (raw score - Mean)/ standard deviation. We know that the raw score is 80, the standard deviation is 10.27, and the mean is 70.27, so plugging in those values gives us: (80 - 70.27)/10.27 = 0.9474</span>
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The difference of two rational numbers is an irrational number. Is the statement true or false?
julia-pushkina [17]

The difference between the two rational numbers results in a rational number.

A rational number is a number that can be express as a fraction.

Hence the final is FALSE

\begin{gathered} Forexample2.5\text{ is a rational numner = }\frac{5}{2} \\ 3.1\text{ is a rational number = }\frac{31}{10} \\ Therefore,\text{   = }\frac{31}{10}\text{ - }\frac{5}{2} \\ =\text{ }\frac{31\text{ - 25}}{10} \\ =\text{ }\frac{6}{10} \end{gathered}

So, the difference between two rational numbers results in a rational number.

7 0
2 years ago
You are going to roll two dice. Let the variable x = the sum of the numbers rolled. What is the probability that x = 9 ?
Vladimir79 [104]

The  first cube can land in any one of  6  ways.
The  second cube can land in any one of  6  ways.
Total number of ways that  2 dice can land = (6 x 6) = 36 ways.

For any of these ways, the sum of the numbers rolled is  9 :

3, 6
4, 5
5, 4
6, 3

There are  4  ways to roll a 9, out of a total of  36  ways that
the dice can land.  So the probability of rolling a  9  is

       4 / 36  =  1 / 9  =  <em>11-1/9 percent</em>


7 0
3 years ago
I need help pls!!! I have 4 minutes left to answer these
ddd [48]

Answer:

its 3/5 so you just add the numerator to the numerator and add the denominator to the denominator.

4 0
3 years ago
Read 2 more answers
Compute the discriminant D(x,y)D(x,y) of the function. f(x,y)=x3+y4−6x−2y2+3 f(x,y)=x3+y4−6x−2y2+3 (Express numbers in exact for
Igoryamba

Answer:

Point                Critical point

Q (2,0)                 local minimum

R (-2,1)                 Saddle

S (2,-1)                  local maximum

T ( -2,-1)                Saddle

O ( -2,0)                Saddle

Step-by-step explanation: INCOMPLETE ANSWER INFORMATION ABOUT THE POINTS ARE RARE

f(x,y) = x³ +y⁴ - 6x -2y² +3

df/dx = f´(x) = 3x² -6x

df/dxdx = f´´(xx) = 6x

df/dy = f´(y) = -4y

df/dydy = 4

df/dydx = df/dxdy = 0

df/dydy = f´´(yy)

D = [ df/dxdx *df/dydy] - [df/dydx]²

D = (6x)*4 - 0

D = 6*2*4     D > 0 and the second derivative on x is  6*2 = 12

so  D > 0 and df/dxdx >0  there is a local minimum in P

Q(2,1)

D = (6*2)*4  D>0  and second derivative on x is 6*2

The same condition there is a minimum in Q

R ( -2,1)

D = 6*(-2)*4 = -48  D< 0 there is a saddle point in R

S (2,-1)

D = 6*2*4 = 48  D > 0 and  df/dxdx = 6*-1  = -6

There is a maximum in S

T ( -2,-1)

D = 6*(-2)*(4) = -48  D<0 there is a saddle point in T

O ( -2,0)

D = 6*(-2)*4 = -48 D<0  there is a saddle point in O

5 0
3 years ago
Pls2sssssssssssssssssssssss
Allisa [31]

Answer:

209.125

Step-by-step explanation:

Since it took the 1.25 as long, you would multiply the numbers together

6 0
3 years ago
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