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Verizon [17]
3 years ago
10

the number off standard deviations between a score and the mean score indicated by a z-score. what was Cindy's z-score on the sc

ience test
Mathematics
1 answer:
aalyn [17]3 years ago
5 0
Z score of 0 gives you the mean for the problem;  The mean μ is 70 Now you can use this value of the mean in the definition of z score for the second case and find the standard deviation. Z score is the number of standard deviations away from the mean.  Therefore σ = (1)(74-70) = 4.
You might be interested in
Santosh spent $200, before tax, on a DVD player and DVDs. The player cost $120, new DVDs cost $15 and used DVDs cost $5. Santosh
gizmo_the_mogwai [7]

Answer:

Santosh purchased 4 new and 4 used DVDs.

Step-by-step explanation:

From the information given, as you know that Santosh spent $200 and that the DVD player cost $120, you can say that the new and used DVDs cost $80, which can be expressed as:

15x+5y=80, where:

x refers to the number of new DVDs

y refers to the number of used DVDs

Now, as the statement indicates that Santosh purchased the same number of new and used DVDs, this means that x is equal to y and you can replace y with x and solve for x:

15x+5x=80

20x=80

x=80/20

x=4

According to this, the answer is that Santosh purchased 4 new and 4 used DVDs.

3 0
3 years ago
Can someone please help me with this thank you!!
kotykmax [81]

Answer:

1. add up all of the arcs.

2x+3x+4x-8+x-12

2. all of the arcs equal 360

2x+3x+4x-8+x-12=360

3. Find x

10x-20=360, x=38

4. angle LTE is equal to half of the sum of the intercepted arcs.

.5(arc LE +GF)

5. plug in LE +GF with x

.5(76+144)

LTE=110

8 0
4 years ago
Mean average of this question plz.
stira [4]
 for this answer
 I got 32
7 0
3 years ago
1. A wise old man once said, "500 reduced by 4 times my age is<br> 296." What is his age?
Daniel [21]

Answer:

51

Step-by-step explanation:

51×4=204

500-204=296

3 0
3 years ago
Triangle ABC has a height of 8 cm and an area of 42cm². <br> Calculate the length of BC.
Tcecarenko [31]

BC must be base

  • Height=8cm
  • Area=42cm^2

We know

\boxed{\sf Area_{(Triangle)}=\dfrac{1}{2} Height\times Base}

\\ \sf\longmapsto 42=\dfrac{1}{2}8BC

\\ \sf\longmapsto 4BC=42

\\ \sf\longmapsto BC=\dfrac{42}{4}

\\ \sf\longmapsto BC=10.5cm

3 0
3 years ago
Read 2 more answers
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