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kumpel [21]
3 years ago
6

Rachael got a 550 on the analytical portion of the Graduate Record Exam (GRE). GRE scores are normally distributed and have mean

μ = 600 and standard deviation σ = 30. If her z-score is -1.67, this leads to an area to the left of 0.0475. Therefore, the percent of students who scored better than she did is
Mathematics
1 answer:
yawa3891 [41]3 years ago
6 0

Answer:

0.0475

Step-by-step explanation:

Given that :

Area To the left :

P(Z < 550) = 0.0475 ; that is proportion who scored better than of 550 has a Zscore of 0.0475.

Hence, percentage of students who scored better than she did will be 0.0475

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30 + a = 40<br> 40 + b = 30<br> c - 3 = 8<br> d - 3 = 8<br> plz answer.
sesenic [268]

Answer:

A= 10

B= -10

C and D both = 11

4 0
2 years ago
Given that x overbarequals3.6667​, s Subscript xequals2.0656​, y overbarequals4.2167​, s Subscript yequals1.5613​, and requalsne
Shtirlitz [24]

Answer:

y = 0.7063x+2.7790

Step-by-step explanation:

Given that

x bar = 3.6667\\s_x= 2.0656\\y bar = 4.2167\\s_7 = 1.5613\\r = -0.9344

We have slope of linear regression line is

a=r*\frac{s_y}{s_x} =0.9344(\frac{1.5613}{2.0656} )\\=0.7063

So regression line would be of the form

y-4.2167 = 0.7063(x-2.0656) (since it passes through xbar, y bar)

y = 0.7063x+2.7790

is the equation of regression line.

6 0
3 years ago
3 An open cone has a vertical angle measuring 40°
belka [17]

Answer:

13.41 cm

Step-by-step explanation:

The radius, height, and HALF of vertical angle makes a triangle.

Where

Radius will be the base of the triangle

Height will be the "height" of the triangle

Top angle will be HALF of vertical angle (40/2 = 20)

From the 20 degree angle, the side "opposite" would be the radius, which is 30. The side "adjacent" would be the height, let it be h.

<em>Which trig ratio relates opposite and adjacent? Yes, that is TAN. Thus we can write:</em>

Tan(20) = opposite/adjacent

Tan(20) = 30/h

h = 30/Tan(20)

h = 13.41

So

The height of the cone would be around 13.41 cm

3 0
3 years ago
Tom had 216 marbles. First, he divided them into 3 equal groups. Then he put two groups into a 2 separate bags. He took the rema
Dahasolnce [82]

Answer: each of his friends got 24 marbles

Step-by-step explanation:

216 / 3 = 72

72 / 3 = 24

3 0
2 years ago
Read 2 more answers
Which is losing the fewest?<br><br> 8<br> -2<br> 5<br> -7
PilotLPTM [1.2K]
-7 is losing the fewest as it is the smallest number, and the number that is to the left of the number line.
5 0
2 years ago
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