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TEA [102]
2 years ago
10

The chart below contains the results of a survey in which students were asked about their cell phone plan.

Mathematics
2 answers:
nata0808 [166]2 years ago
8 0

Answer:

16% To get the answer all you have to do is add.

nekit [7.7K]2 years ago
3 0

Answer:

Option (C)

Step-by-step explanation:

Students having phone plans with texting = Students with plan of voice and texting + Students with plan of voice, texting and data

= 12 + 4

= 16

Total number of students with different plans = 20 + 14 + 12 + 4

                                                                            = 50

Percentage of students using phone plans with texting

= \frac{\text{Students using plans with texting}}{\text{Total number of students surveyed}}\times 100

= \frac{16}{50}\times 100

= 32%

Therefore, Option (C) will be the answer.

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Step-by-step explanation:

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-0.46x+0.16x=6.6<br><br> Thank you!
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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

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3 years ago
The Jones family has 2 kids, 1 boy and 1 girl. Suppose that for each birth, the probability of a boy birth is
nirvana33 [79]

Answer:

1/2

Step-by-step explanation:

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