Please Answer this! 65 + _____ − 15 = 65 a −b +b = _____ C-D+D=

b) The university gym opens at 9 am on Saturday mornings. One Saturday morning at 8:55 am there are 15 students outside the gym

max2010maxim [7]

Answer:

The complete question is:

At a university, 13% of students smoke.

a) Calculate the expected number of smokers in a random sample of 100 students from this university:

b) The university gym opens at 9 am on Saturday mornings. One Saturday morning at 8:55 am there are 27 students outside the gym waiting for it to open. Should you use the same approach from part (a) to calculate the expected number of smokers among these 27 students?

Part a is easy, because is a random sample, we can expect that just 13% of these 100 students to be smokers, and 13% of 100 is 13, so we can expect 13 of those 100 students to be smokers.

b) This time we do not have a random sample, our sample is a sample of 15 students who go to the gym in the early morning, so our sample is biased. (And we do not know if this bias is related to smoking or not, and how that relationship is), so we can't use the same approach that we used in the previous part.

3 0

3 years ago

1.

777dan777 [17]

1. The 4 is in the thousands place
2. 50
3. 2,168 + 305 = 2473
4. estimate 156 + 235
160 + 240 = 400
5. 8,631 - 5,950 = 2,681
6. 724 * 17 = 12,308
7. 14÷6,230 = 2.25× $10^{-3}$ 
8. 962÷ 39
960÷ 40 = 24
9. .7
10. 36.90
+7.35
-----------
44.25

11. 9.610
-0.268
----------
9.342

12. 419.2
x 2.54
-------------
16768
209600
838400
--------------
1064.768

13. 4 $\sqrt{128.600}$ (pretend sqrt sign is division sign
 -0
--------
12
-12
--------
 08
- 8
--------
06
-4
----------
20
-20
--------
0
answer: 32.150
14. least to greatest: 0.031, 0.124, 0.31, 0.5, 1.24
15. 29.95
x 36
-----------
17970
- 89850
-----------
107820

5 0

3 years ago

Read 2 more answers

. A pitcher’s mound on a women’s softball field is 43 feet from home plate and the distance between the bases is 60 feet. How fa

butalik [34]

Answer:

42.43 ft

Step-by-step explanation:

Please find attached an image of the softball pitch

h² = p² + f² -2x p×f×cos45

h² = 43² + 60² - 2x (43)(60) x 0.7071

h² = 1849 + 3600 - 3648.636

h² = 1800.364

h = √1800.364

h = 42.43 feet

8 0

3 years ago

Keller wants to give his friend 2 books. He can choose books on subjects from fiction, history, computers, science, general know

Maslowich

Answer:

15

Step-by-step explanation:

Pat, Jo, Al, Dan

Pat, Al, Dan, Jo

Pat, Dan, Jo, Al

Pat, Jo, Dan, Al

Pat, Al, Jo, Dan

Pat, Dan, Al, Jo List all permutations beginning with Pat.

Jo, Al, Dan, Pat

Jo, Dan, Pat, Al

Jo, Pat, Al, Dan

Jo, Al, Pat, Dan

Jo, Dan, Al, Pat

Jo, Pat, Dan, Al List all permutations beginning with Jo.

Al, Dan, Pat, Jo

Al, Pat, Jo, Dan

Al, Jo, Dan, Pat

Al, Pat, Dan, Jo

Al, Dan Jo, Pat

Al, Jo, Pat, Dan List all permutations beginning with Al.

Dan, Pat, Jo, Al

Dan, Jo, Al, Pat

Dan, Al, Pat, Jo

Dan, Jo, Pat, Al

Dan, Pat, Al, Jo

Dan, Al, Jo, Pat List all permutation beginning with Dan.

There are 24 ways for Pat, Jo, Al, and Dan to finish in first, second, third, and fourth place in the contest.

6 0

2 years ago

Charmaine cutaway 3.65 meters of rope. Before that, she had 9 meters of rope. How much rope does Charmaine have left?

mihalych1998 [28]

Answer:

5.35

Step-by-step explanation:

9-3.65=5.35

4 0

3 years ago

Please Answer this! 65 + _____ − 15 = 65 a −b +b = _____ C-D+D=_ Please explain too

Please Answer this! 65 + _ − 15 = 65 a −b +b = _ C-D+D=_ Please explain too