<span>Probability = 0.063 Fourth try = 0.0973 Let X be the number of failed attempts at passing the test before the student passes. This is a negative binomial or geometric variable with x â {0, 1, 2, 3, . . .}, p = P(success) = 0.7 and the number of successes to to observe r = 1. Thus the pmf is nb(x; 1, p) = (1 â’ p) xp. The probability P that the student passes on the third try means that there were x = 2 failed attempts or P = nb(2, ; 1, .7) = (.3)2 (.7) = 0.063 . The probability that the student passes before the third try is that there were two or fewer failed attmpts, so P = P(X â‰¤ 2) = nb(0, ; 1, .7) + nb(1, ; 1, .7) + nb(2, ; 1, .7) = (.3)0 (.7) + (.3)1 (.7) + (.3)2 (.7) = 0.973 .</span>

4 0

2 years ago

If arc AE = 64° and arc BD = 20°, find the measure of angle BCD.

tamaranim1 [39]

Angle mes BCD = (mes Arc AE-mes ARC BD)/2

Plug: mes BCD = (64+20)/2 = 44° (Number C)

5 0

2 years ago

HELP ME!!! Then I will help you on a question.

Firlakuza [10]

Answer:

$150

Step-by-step explanation:

Let the account earns 5% APR as simple interest for the invested principal.

Now, the formula of simple interest gives that,

$A = P(1 + \frac{rt}{100})$ , where A is the final amount, P is the principal amount invested, r is the % of interest and t is the number of years for which the principal is invested.