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vovikov84 [41]
3 years ago
13

Helen had to read 148 pages of her science textbook in the 4 days remaining before an exam. If she reads the same number of page

s each day, how many pages will she need to read each day?a. 38b. 37c. 36d. 40
Mathematics
1 answer:
iragen [17]3 years ago
8 0

Answer:

b)37

Step-by-step explanation:

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Can somebody help me find the perimeter of this figure?
lbvjy [14]

Answer: P = 64in,

Step-by-step explanation:  P = 17 + 13 + 25 + 9

3 0
3 years ago
21. 3x + 4 = x2<br> How would I solve this using the quadratic equation
hodyreva [135]

Answer:

old

Step-by-step explanation:

idk because I'm just to pit down this because we haven't learned this yet

4 0
3 years ago
A recent study suggested that 70% of all eligible voters will vote in the next presidential election. Suppose 20 eligible voters
natita [175]

Answer:

0.0479 = 4.79% probability that fewer than 11 of them will vote

Step-by-step explanation:

For each voter, there are only two possible outcomes. Either they will vote, or they will not. The probability of a voter voting is independent of any other voter, which means that the binomial probability distribution is used to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

In which C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

And p is the probability of X happening.

70% of all eligible voters will vote in the next presidential election.

This means that p = 0.7

20 eligible voters were randomly selected from the population of all eligible voters.

This means that n = 20

What is the probability that fewer than 11 of them will vote?

This is:

P(X < 11) = P(X = 10) + P(X = 9) + P(X = 8) + P(X = 7) + P(X = 6) + P(X = 5) + P(X = 4) + P(X = 3) + P(X = 2) + P(X = 1) + P(X = 0)

In which

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

P(X = 10) = C_{20,10}.(0.7)^{10}.(0.3)^{10} = 0.0308

P(X = 9) = C_{20,9}.(0.7)^{9}.(0.3)^{11} = 0.0120

P(X = 8) = C_{20,8}.(0.7)^{8}.(0.3)^{12} = 0.0039

P(X = 7) = C_{20,7}.(0.7)^{7}.(0.3)^{13} = 0.0010

P(X = 6) = C_{20,10}.(0.7)^{6}.(0.3)^{12} = 0.0002

P(X = 5) = C_{20,5}.(0.7)^{5}.(0.3)^{15} \approx 0

The probability of 5 or less voting is very close to 0, so they will not affect the outcome. Then

P(X < 11) = P(X = 10) + P(X = 9) + P(X = 8) + P(X = 7) + P(X = 6) + P(X = 5) + P(X = 4) + P(X = 3) + P(X = 2) + P(X = 1) + P(X = 0) = 0.0308 + 0.0120 + 0.0039 + 0.0010 + 0.0002 = 0.0479

0.0479 = 4.79% probability that fewer than 11 of them will vote

8 0
3 years ago
What is the length of this rectangular prism?Is it 5 or 3 or 6 or 2
vesna_86 [32]
We can't see the rectangular prism...
8 0
2 years ago
PLEASE I need help I don’t understand this math and I have less then 20 minutes so help is really needed please also if you can
adoni [48]

Answer:

false

Step-by-step explanation:

because 14x7 = 98

4 0
3 years ago
Read 2 more answers
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