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2 years ago

PLEASE HELP!! I WILL GIVE BRAINLIEST!! I don’t understand please help with number 15 & 16

Mathematics

1 answer:

olga55 [171]2 years ago

6 0

Answer:

Step-by-step explanation:

15) t = 1 , 3t - 2 = 3*1 - 2 = 3 - 2 = 1

t =2, 3t - 2 = 3*2 - 2 = 6 -2 = 4

t = 3, 3t - 2 = 3*3 - 2 = 9 - 2 = 7

t = 4 , 3t - 2 = 3*4 - 2 = 12 - 2 = 10

Series : 1,4,7,10,.........

a = first term = 1

d = common difference = 2nd term - first term = 4 - 1 = 3

n = number of terms = 20

S = $\frac{n}{2}*(2a + (n-1)d)$

$=\frac{20}{2}(2*1 +19*3)\\\\= 10 * (2 + 57)\\\\= 10* 59\\\\= 590$

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2 years ago

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tia_tia [17]

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Step-by-step explanation:

We are given that a recent study showed that the length of time that juries deliberate on a verdict for civil trials is normally distributed with a mean equal to 12.56 hours with a standard deviation of 6.7 hours.

Let X = length of time that juries deliberate on a verdict for civil trials

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The z score probability distribution is given by;

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where, $\mu$ = mean time = 12.56 hours

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So, Probability that deliberation will last between 12 and 15 hours is given by = P(12 hours < X < 15 hours) = P(X < 15) - P(X $\leq$ 12)

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