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anastassius [24]
3 years ago
15

At the Olympic games, many events have several rounds of competition. One of these events is the men's 100100100-meter backstrok

e.
The upper dot plot shows the times (in seconds) of the top 888 finishers in the final round of the 201220122012 Olympics. The lower dot plot shows the times of the same 888 swimmers, but in the semifinal round.


Which pieces of information can be gathered from these dot plots? (Remember that lower swim times are faster.)

Mathematics
1 answer:
padilas [110]3 years ago
8 0

Answer:

C

Step-by-step explanation:

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(1 point) A recent report for a regional airline reported that the mean number of hours of flying time for its pilots is 56 hour
Ray Of Light [21]

Answer:

(53.812 ; 58.188) ; 156

Step-by-step explanation:

Given that :

Sample size (n) = 51

Mean (m) = 56

Standard deviation (σ) = 9.5

α = 90%

Using the relation :

Confidence interval = mean ± Error

Error = Zcritical * (standard deviation / sqrt (n))

Zcritical at 90% = 1.645

Error = 1.645 * (9.5 / sqrt(51))

Error = 1.645 * 1.3302660

Error = 2.1882877

Hence,

Confidence interval :

Lower boundary = 56 - 2.1882877 = 53.8117123

Upper boundary = 56 + 2.1882877 = 58.1882877

Confidence interval = (53.812 ; 58.188)

2.)

Margin of Error (ME) = 1.25

α = 90%

Sample size = ((Zcritical * σ) / ME)^2

Zcritical at 90% = 1.645

Sample size = ((1.645 * 9.5) / 1.25)^2

Sample size = (15.6275 / 1.25)^2

Sample size = 12.502^2 = 156.3000

Sample size = 156

3 0
3 years ago
Please help plzzzzz........​
leva [86]

Answer:

a=108

Step-by-step explanation:

180x3=540

540/5=108

a=108˚

6 0
3 years ago
You bought two tickets to the movies at a price of $7 and six tickets at a price of $5
Stels [109]

Hello! They answer to your question would be that you spent $44. This was because 7*2=14 and 6*5-30. Therefore, 14+30=44.

4 0
3 years ago
What are the zeros of the function y=2x^2 +7x+3
enyata [817]
The zeros are (-3,0) and (-0.5,0)
5 0
3 years ago
It’s asking for LATERAL surface area btw
lozanna [386]

Answer:

Lateral surface area = 826.5 m²

Step-by-step explanation:

Formula to calculate the lateral surface area of the triangular prism,

Lateral surface area of the triangular prism = Perimeter of the triangular base × Height

Perimeter of the triangular base = 6 + 11 + 12

                                                      = 29 m²

Height of the prism = 28.5 m

Therefore, lateral surface area of the prism = 29 × 28.5

                                                                        = 826.5 m²

5 0
3 years ago
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