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Mkey [24]
3 years ago
15

Femi’s last 5 bowling scores were 68 75 90 and 80 what was femis mean score

Mathematics
1 answer:
posledela3 years ago
7 0
It says last 5 bowling scores but there’s only four numbers listed just fyi

To find the mean, add all the numbers up and then divide by how many numbers you just added.

So, let’s add 68, 75, 90, 80

That equals 313. Now let’s divide by four, since we added four numbers together.

313 divided by four equals 78.25

So out of those four scores you gave me, her average was score 78.25

Hope this helped :)
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Can anyone please solve this question
DENIUS [597]
The first number is 27 and the second number is 45 so the ratio would be 27;45
5 0
3 years ago
What values of x make the equation x2 + 9x – 22 = 0 true? Check all that apply. –11 –2 0 2 11
Marat540 [252]
Answer:  x = 2 ;  -11 .
___________________________________
Explanation:
_____________________________________________
Given the equation:
_____________________________________________
  x² + 9x −<span> 22 = 0  ;  Solve for:  "x" ;
_____________________________________________

Let us factor the "left-hand side" of the equation:
_____________________________________________
  "x</span>² + 9x −<span> 22"  ;
_____________________________________________

What are the factors of "-22"" that add up to "positive 9" ?
_____________________________________________
  Let us list the factors of "-22" :
____________________________________________
-2, 11;  </span>→ -2 + 11 = 9 ;<span>
-11, 2;  </span>→ -11 + 2 = -9 ;<span>
____________________________________________

So we have:  "-2" and "11" ;
____________________________________________
So;   </span>  "x² + 9x − 22" ; factors into " (x−2)(x + 11)" ;
____________________________________________
We have:  (x−2)(x + 11) = 0 ;

So:  x − 2 = 0 ;  

Add "2" to each side of the equation; 

     x − 2 + 2 = 0 + 2 ; 

          x = 2 ; 
___________________________________
   x + 11 = 0 ;

Subtract "11" from each side of the equation;

   x + 11 − 11 = 0 − 11 ;

      x = -11 ; 
___________________________________
 Answer:  x = 2 ; -11 .
___________________________________
6 0
3 years ago
Justin has a savings account.
andrey2020 [161]

Answer:

220

Step-by-step explanation:

Multiply 15 times 10 =150

150+70=220

Hope this helps :)

6 0
2 years ago
Read 2 more answers
Combine
RideAnS [48]

add like terms

 2a - 3b + 5b - a

= (2a - a)  +  (-3b + 5b)

=     a       +      2b

Answer: D) a + 2b

5 0
3 years ago
Read 2 more answers
A school psychologist notes that the average number of times that students are disruptive during class is 1.4 [μ=1.4] times per
marta [7]

Answer:

Reject the Null ;

0.928

Step-by-step explanation:

Given the data: 2, 4, 3, 5, 1, 1, 4

Sample mean = (2 + 4 + 3 + 5 + 1 + 1 + 4) / 7 = 2.857

Standard deviation, s = 1.57 ( using calculator)

The hypothesis :

H0 : μ = 1.4

H1 : μ ≠ 1.4

Since sample size is small, use T test

Test statistic :

Tstatistic = (x - μ) / s/sqrt(n)

Tstatistic = (2.857 - 1.4) / 1.57/sqrt(7)

Tstatistic = 1.457 / 0.593 = 2.455

Two tailed test at α = 0.05

Tcritical at df = 7-1 = 6 ; α = 0.05 = 2.447

Tstatistic > Tcritical ; reject the null

Since ;

2.455 > 2.447 ; we reject the null ;

There is significam evidence that Number of complaints has changed.

Effect size ;

d = (x - μ) / s

d = (2.857 - 1.4) / 1.57

d = 1.457 / 1.57

d = 0.928

5 0
3 years ago
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