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AveGali [126]
3 years ago
14

Please help i been stuck on these type of problems for the last hr can sumone explain

Mathematics
1 answer:
slava [35]3 years ago
5 0
False
False
False
True?
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Sandra swims the 100-meter freestyle for her school’s swim team. Her state’s ranking system awards 3 points for first place, 2 p
Elina [12.6K]

Answer:

2.25

Step-by-step explanation:

The total frequency is:

20 + 12 + 6 + 2 = 40

Calculate the probability of each score:

P(X=3) = 20/40 = 0.50

P(X=2) = 12/40 = 0.30

P(X=1) = 6/40 = 0.15

P(X=0) = 2/40 = 0.05

So the expected value is:

E = (3)(0.50) + (2)(0.30) + (1)(0.15) + (0)(0.05)

E = 2.25

5 0
3 years ago
<img src="https://tex.z-dn.net/?f=%5Csqrt%7B0.81%7D" id="TexFormula1" title="\sqrt{0.81}" alt="\sqrt{0.81}" align="absmiddle" cl
Mandarinka [93]

Answer: .9

Step-by-step explanation:

3 0
3 years ago
Find the quotient 4/15÷1/6
Solnce55 [7]

Answer:

1 3/5

Step-by-step explanation:

4/15÷1/6

Copy dot flip

4/15 * 6/1

24/15

Divide the top and bottom by 3

8/5

Change the improper fraction to a mixed number

5 goes into 8 1 time with 3 left over

1 3/5

4 0
3 years ago
I need help on doing this
Rudik [331]

Answer:

#5A=6

5B=4

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
On the xy-plane, the graph of function f has x-intercepts at -3, -1, and 1. which of the following could define f?
vekshin1
X intercept is when y=0
or f(x) = 0
set the f(x)'s to 0
your answer is C
x-1=0 x+1=0  x+3=0
so x= -3, -1, and 1
7 0
3 years ago
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