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2 years ago

Find the product. Simplify if possible

Mathematics

2 answers:

KATRIN_1 [288]2 years ago

4 0

−1/3⋅(8 1/7)

change 8 1/7 to an improper fraction

8 1/7 = (7*8 +1)/7 = 57/7

-1/3 * 57/7

-57/21

21 goes into 57 2 times with 15 left over

-2 15/21

divide top and bottom of the fraction by 3

-2 5/7

Choice B

swat322 years ago

4 0

change the mixed number to an improper fraction

8 $\frac{1}{7}$ = $\frac{57}{7}$

- $\frac{1}{3}$ × $\frac{57}{7}$ = - $\frac{19}{7}$ = - 2 $\frac{5}{7}$ → b

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State the measurement of <1

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57 degrees

Step-by-step explanation:

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2 years ago

assume that when adults with smartphones are randomly selected 15 use them in meetings or classes if 15 adult smartphones are ra

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The probability that at least 4 of them use their smartphones is 0.1773.

Step-by-step explanation:

We are given that when adults with smartphones are randomly selected 15% use them in meetings or classes.

Also, 15 adult smartphones are randomly selected.

Let X = Number of adults who use their smartphones

The above situation can be represented through the binomial distribution;

$P(X = r) = \binom{n}{r}\times p^{r} \times (1-p)^{n-r} ; n = 0,1,2,3,.......$

where, n = number of trials (samples) taken = 15 adult smartphones

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p = probability of success which in our question is the % of adults

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So, X ~ Binom(n = 15, p = 0.15)

Now, the probability that at least 4 of them use their smartphones is given by = P(X $\geq$ 4)

P(X $\geq$ 4) = 1 - P(X = 0) - P(X = 1) - P(X = 2) - P(X = 3)

= $1- \binom{15}{0}\times 0.15^{0} \times (1-0.15)^{15-0}-\binom{15}{1}\times 0.15^{1} \times (1-0.15)^{15-1}-\binom{15}{2}\times 0.15^{2} \times (1-0.15)^{15-2}-\binom{15}{3}\times 0.15^{3} \times (1-0.15)^{15-3}$

= $1- (1\times 1\times 0.85^{15})-(15\times 0.15^{1} \times 0.85^{14})-(105 \times 0.15^{2} \times 0.85^{13})-(455 \times 0.15^{3} \times 0.85^{12})$

= 0.1773

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Will give brainlist plz help its for my 9 week exam a. 228 b. 229 c. 172 d. 171

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I think its 229

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Answer:

$\dfrac{2}{3}.$