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scoray [572]
3 years ago
11

Elena a cumpărat de la cofetărie 12 prajituri unele cu ciocolata si altele cu frișcă numărul prăjiturilor cu ciocolata este cu 2

mai mare decât al celor cu frișcă Câte prăjituri cu frișcă a cumpărat elena
Mathematics
1 answer:
butalik [34]3 years ago
6 0
A cumparat 5 prajituri cu vanilie si 7 cu ciocolata.
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What is the value of x?​
exis [7]

Step-by-step explanation:

x-4+3x+100=180

4x+96=180

4x=84

x=21

4 0
3 years ago
A new screening test for West Nile Virus is developed for use in the general population. The sensitivity and specificity of the
morpeh [17]

The predictive value of a positive test is is 0.43.

------------------

This question is solved using the concepts of sensitivity and specificity.

  • Sensitivity: It is the true negative rate, that is, the proportion of people without the disease that test negative.
  • Specificity: It is the true positive rate, that is, the proportion of people with the disease that test positive.

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  • Sensitivity of 60% means that of the 100 - 10 = 90% of people without the disease, 60% test negative and 100 - 60 = 40% test positive.
  • Specificity of 70% means that of the 10% with the disease, 70% test positive.

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The predictive value of a positive test is:

Probability of a positive test, which is 40% of 90% plus 70% of 10%, so:

p = 0.4\times0.9 + 0.7\times0.1 = 0.43

The predictive value of a positive test is is 0.43.

A similar question is given at brainly.com/question/22373775

7 0
2 years ago
DO NOT BE DISCOURAGED IF YOU SEE AN ANSWER! PLEASE HELP ASAP WILL GIVE BRAINLIEST AND THANKS AND 5 STAR RATING TO THE CORRECT AN
nignag [31]

See the attached picture:

8 0
3 years ago
Is how old are you? a statistical question
HACTEHA [7]

Answer:

Hey!

NO IT IS NOT A STATISTICAL QUESTION!

Step-by-step explanation:

This is because you are including ONLY YOU...this wont work as statistics take data from a COLLECTION of people or things!

<u>So a better question will be :</u>

HOW OLD ARE THE PEOPLE IN MY NEIGHBORHOOD?

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HOPE THIS HELPS!!

5 0
3 years ago
Solve the proportion<br> h/4=7/14
BabaBlast [244]
H/4=7/14
we cross multiply , so
14*h = 7*4
14h=28
divide by 14 on both sides
h=28/2=2
4 0
2 years ago
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