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ahrayia [7]
3 years ago
8

A student earned a grade of 80% on a math text that had 20 problems. How many problems on this test did the student answer corre

ctly?
Mathematics
1 answer:
mars1129 [50]3 years ago
7 0
The student got 16 problems correct.
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X is a normally Distributed random variable with a standard deviation of 4.00. Find the mean of X when 64.8% of the area lies to
Cerrena [4.2K]

Answer:

7

Step-by-step explanation:

σ = 4 ; μ =?

8.52 to the left of X

.

P(X < 8.52) = 64.8%

P(X < 8.52) = 0.648

Using the Z relation :

(x - μ) / σ

P(Z < (8.52 - μ) / 4)) = 0.648

The Z value of 0.648 of the lower tail is equal to 0.38 (Z probability calculator)

Z = 8.52 - μ / 4

0.38 = 8.52 - μ / 4

0.38 * 4 = 8.52 - μ

1.52 = 8.52 - μ

μ = 8.52 - 1.52

μ = 7

5 0
3 years ago
HELP ASAP PLSSSS (MNATH, BRAINLIST) HELP PLS!!!
Nadusha1986 [10]

Answer is 180 degree

Hope it helps

8 0
3 years ago
6mn (2m-3n) equals to?
Free_Kalibri [48]

Answer and Step-by-step explanation:

Distribute the 6mn to the 2m and -3n

The answer is:

(12m^{2} n ) - 18mn^{2}

#teamtrees #WAP (Water And Plant)

6 0
3 years ago
Read 2 more answers
Math be hard- Can ya help?
horrorfan [7]

Answer:

1/8

Step-by-step explanation:

The slope equation for this problem is

y2-y1

--------

x2-x1

So the y2=4, y1=3, x2=8, and x1=0

4-3      =1

-----       --

8-0     =8

Which is 1/8

7 0
2 years ago
Read 2 more answers
water stations will be placed every 600 meters of a fifteen kilometer race. how many water stations will be needed?
Snezhnost [94]
1km=1000metres
15km=15000 metres 
15000/600=25
25-1=24 (minus the last one)

hope this helps :)
5 0
3 years ago
Read 2 more answers
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