All categories

3 years ago

On a cold day, the temperature in a certain city changed - 23.8°F

Mathematics

1 answer:

konstantin123 [22]3 years ago

8 0

Answer:

-3.5°F

Step-by-step explanation:

-23.8°F/6.8(hrs)= -3.5°F

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What are the missing numbers in the data set? Assume the numbers are in order

prohojiy [21]

Answer:

This answer is 42

Step-by-step explanation:

42 - 24 = 18

6 0

3 years ago

HELP!!

cluponka [151]

42 6 7 times is 42 so the answer will be 42

7 0

3 years ago

Read 2 more answers

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

Find the missing probability. P(B)=720,P(A|B)=14 ,P(A∩B)=?

Ivan

Answer:

7/80

Step-by-step explanation:

Given that: P(B) = 7 / 20, P(A|B)= 1 / 4

Bayes theorem is used to mathematically represent the conditional probability of an event A given B. According to Bayes theorem:

$P(A|B)=\frac{P(A \cap B)}{P(B)}$

Where P(B) is the probability of event B occurring, P(A ∩ B) is the probability of event A and event B occurring and P(A|B) is the probability of event A occurring given event B.

$P(A|B)=\frac{P(A \cap B)}{P(B)}\\\\P(A \cap B)=P(A|B)*P(B)\\\\Substituting:\\\\P(A \cap B)=1/4*7/20=7/80\\\\P(A \cap B)=7/80$

6 0

3 years ago

What are the solutions to x2 + x - 5≤0

Juliette [100K]

I have no idea what that x is doing, so imma take it out.

2+x-5≤0

-3+x≤0

+3 +3

x≤3

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hope it helps

8 0

3 years ago