What's 7/9 divided by 8/15

2 answers:

7 0

Dividing by a fraction is the same as multiplicating by its inverse, I mean:
(a/b)/(c/d) = (a/b)(d/c)
so for the fractions we have:
7/9 divided by 8/15
= (7/9)/(8/15)
= (7/9)(15/8)
= 7*15/9*8
= 105/72
= 35/24

statuscvo [17]3 years ago

5 0

35 over 24 or do u want it in a decimals

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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

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kirza4 [7]

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Step-by-step explanation:

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