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BartSMP [9]
3 years ago
14

A train traveled 350km in 2.5h. what was the average speed of the train?

Mathematics
1 answer:
omeli [17]3 years ago
4 0
So the train traveled 350 km in 2.5 h let's do the work together what do you think we start off with we can divide 350 by 2.5 tell me what your answer is when you've done the division
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B. it is the area of a circle with a<br> diameter of 1. <br> True of false
Dominik [7]
It has to be true because you would need to divide
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Which point is not part of circle C?<br><br> C<br> P<br> Q<br> R
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A moving company charges $0.70 per pound for a move from New York to Florida. A family estimates that their belongings weigh abo
mamaluj [8]

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3 years ago
Since an instant replay system for tennis was introduced at a major​ tournament, men challenged 1406 referee​ calls, with the re
erastova [34]

Answer:

Step-by-step explanation:

This is a test of 2 population proportions. Let 1 and 2 be the subscript for men and women players. The population proportions of men and women challenges for calls would be p1 and p2

P1 - P2 = difference in the proportion of men and women challenges for calls.

The null hypothesis is

H0 : p1 = p2

p1 - p2 = 0

The alternative hypothesis is

Ha : p1 ≠ p2

p1 - p2 ≠ 0

it is a two tailed test

Sample proportion = x/n

Where

x represents number of success(number of complaints)

n represents number of samples

For old dough

x1 = 416

n1 = 1406

P1 = 416/1406 = 0.3

For new dough,

x2 = 217

n2 = 778

P2 = 217/778 = 0.28

The pooled proportion, pc is

pc = (x1 + x2)/(n1 + n2)

pc = (416 + 217)/(1406 + 778) = 0.29

1 - pc = 1 - 0.29 = 0.71

z = (P1 - P2)/√pc(1 - pc)(1/n1 + 1/n2)

z = (0.3 - 0.28)/√(0.29)(0.71)(1/1406 + 1/778) = 0.02/√0.00553857907

z = 0.99

Since it is a two tailed test, the curve is symmetrical. We will look at the area in both tails. Since it is showing in one tail only, we would double the area

From the normal distribution table, the area below the test z score to the left of 0.99 is 1 - 0.84 = 0.16

We would double this area to include the area in the left tail of z = - 0.99 Thus

p = 0.16 × 2 = 0.32

Since 0.1 < 0.5, we would accept the null hypothesis.

p value = 0.337

Since 0.05 < 0.32, we would accept the null hypothesis

7 0
3 years ago
Which of the following formulas, when evaluated using rational values for the variables, will result in an irrational number?
gogolik [260]
A. because pi is a irrational # 

5 0
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