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Sever21 [200]
3 years ago
6

The number 63 is how many times the number 21?

Mathematics
2 answers:
Andrei [34K]3 years ago
8 0

Answer:

21 * 3 = 63

Step-by-step explanation:

tatiyna3 years ago
3 0

Answer:

3

Step-by-step explanation:

cause 63 divided by 21 is 3.

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Kaylee decided to donate 30% of her savings if she has $238 in her savings account about how much will she Donate
balu736 [363]

Answer: Donate $71.40

Step-by-step explanation:

To calculate a percentage of an amount, we have to multiply that percentage by the amount and divide by 100.

Donate =  $238 · 30 ÷ 100 = $7,140 ÷ 100 = $71.40

Answer : Donate $71.40

\textit{\textbf{Spymore}}

3 0
3 years ago
4-It has been a bad day for the market, with 70% of securities losing value. You are evaluating a portfolio of 20 securities and
riadik2000 [5.3K]

Answer:

b) 0.0007

c) 0.4163

d) 0.2375

Step-by-step explanation:

We are given the following:

We treat securities lose value as a success.

P(Security lose value) = 70% = 0.7

Then the securities lose value follows a binomial distribution, where

P(X=x) = \binom{n}{x}.p^x.(1-p)^{n-x}

where n is the total number of observations, x is the number of success, p is the probability of success.

Now, we are given n = 20.

a) Assumptions

  • There are 20 independent trials.
  • Each trial have two possible outcome: security loose value or security does not lose value.
  • The probability for success of each trial is same, p = 0.7

b) P(all 20 securities lose value)

We have to evaluate:

P(x = 20)\\= \binom{20}{0}(0.7)^0(1-0.7)^{20}\\= 0.0007

0.0007 is the probability that all 20 securities lose value.

c) P(at least 15 of them lose value.)

P(x \geq 15)\\= P(x=15) + P(x = 16) + P(x=17) + P(x=18) +P(x = 19) +P(x = 20)\\ \binom{20}{15}(0.7)^{15}(1-0.7)^{5} +...+ \binom{20}{20}(0.7)^{20}(1-0.7)^{0} \\=0.4163

d) P(less than 5 of them gain value.)

P(gain value) = 1 - 0.7 = 0.3

P(x < 5)\\= P(x=0) + P(x = 1) + P(x=2) + P(x=3) +P(x = 4)\\ \binom{20}{0}(0.3)^{0}(1-0.3)^{20} +...+ \binom{20}{4}(0.3)^{4}(1-0.3)^{16} \\=0.2375

7 0
3 years ago
Can you please help me and I will give you Brainliest.​
wel

Answer:

b and e

Step-by-step explanation:

these are the only expressions that if you simplify all the way out you get 12y+24.

7 0
3 years ago
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There are 3 students to 1 adult on a field trip.You need to find the number of adults needed for 24 students. What would the sec
AysviL [449]

Answer: 24 : 8   <em>or   </em>24 to 8

Step-by-step explanation:

Let the number of adults be x

3/1 = 24/x .     We have to do cross multiplication,

24 = 3x

 x = 8

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3 years ago
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