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Marta_Voda [28]
3 years ago
12

In a very survey of 60 student,60 study botany 50 study zoology and 48 studied biology.if 38 study all,how many study zoology al

one and how many student study none

Mathematics
1 answer:
BabaBlast [244]3 years ago
6 0

Answer:

12 study zoology alone and 0 study none

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Sedaia [141]
If the fraction is for example 1/4, try to graph it at before the half by a little.
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3 years ago
The time spent waiting in the line is approximately normally distributed. The mean waiting time is 6 minutes and the variance of
White raven [17]

Answer:

0.3075 = 30.75% probability that a person will wait for more than 7 minutes.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

The standard deviation is the square root of the variance.

In this problem, we have that:

\mu = 6, \sigma = \sqrt{4} = 2

Find the probability that a person will wait for more than 7 minutes.

This is 1 subtracted by the pvalue of Z when X = 7. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{7 - 6}{2}

Z = 0.5

Z = 0.5 has a pvalue of 0.6915

1 - 0.6915 = 0.3075

0.3075 = 30.75% probability that a person will wait for more than 7 minutes.

7 0
2 years ago
Question 23) Triangle PQR Triangle XYZ<br> PQ = 3a + 4 and XY = 5a - 12. Find a and PQ.
uysha [10]
A=8 and PQ=28.

the way I solved the problem is attached. hope this helped.

4 0
3 years ago
Jon is 14 years older than Philip.Two years from now,Jon will be 3 times as old as Philip.How old is each now?
DanielleElmas [232]

Philip is 5 years old and Jon is 19 years old now.

Step-by-step explanation:

Step 1 :

Let x be the age of Philip Now

Since Jon is 14 years older than Philip,

Age of Jon = 14 + x

Step 2 :

After  2 years,

Age of Philip = x+ 2

Age of Jon = 14+x+2 = 16+x

Step 3 :

Given that in 2 years, Jon will be 3 times as old as Philip.

So we have 16 + x =3(x+2)

=> 16 + x = 3x +6

=> 2x = 10 = x = 5

Hence age of Philip is 5 years

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7 0
3 years ago
Graph the equation 4x-3y=12
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send me your email I have a graph on my desmos account
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