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Gnoma [55]
3 years ago
6

Which statement is true?

Mathematics
2 answers:
Amiraneli [1.4K]3 years ago
8 0
All squares are rectangles, as squares are a subset. 2 is false because rectangles are a subset. 3 is false because not all parallelograms have right angles. 4 is false (look at first sentence in answer.)



ra1l [238]3 years ago
3 0
The correct answer is:  [A]:  "All squares are rectangles."
______________________________________________________
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The plan of a park is at a scale of 1:5000. Calculate the actual distance between two points if the distance between two points
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3 years ago
According to a 2010 study conducted by the Toronto-based social media analytics firm Sysomos, 71% of all tweets get no reaction.
klemol [59]

Answer:

a) the expected number of tweets with no reaction is 71 tweets

b) the variance is 20.59 tweets² ( ≈ 21 tweets )and the standard deviation is

4.537 tweets (≈ 5 tweets)

Step-by-step explanation:

we can use the binomial probability distribution

P(x, N, p ) = N!/[(N-x)!x!] * p^x * (1-p)^(N-x)

where

x = number of successful events

N = population total

p = probability for success for every individual and independent event

P = probability for x successful events

in our case p = 71% = 71/100 (probability of a tweet without reaction) , N = 100 tweets

a) the expected number of tweets

E(x) = N* p = 100 tweets * 71/100 = 71 tweets

b) the variance is

V(x) = N * p * (1-p)

V = 100 * 71/100 * (1-71/100) = 71* 29/100 = 20.59 tweets² ( units of variance are [N²] )

the standard deviation is

s = √V = √20.59 tweets² = 4.537 tweets

6 0
3 years ago
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