There are 400 students in a school. In Zachary's class, 18 out of 30 students participate in after-school activities. Based on Zachary's class, about how many students in the school are predicted to participate in after-school activities?

3 0

3 years ago

What is the pre-image of vertes. A' if the image shown on

nydimaria [60]

Answer:

Step-by-step explanation:

because it's the right answer

5 0

3 years ago

A) César se tarda alrededor de 14 de hora en resolver un problema de matemáticas, 1 de hora en

sineoko [7]

please write in proper English to answer

8 0

3 years ago

Tomato as a taste modifier. Miraculin—a protein naturally produced in a rare tropical fruit—can convert a sour taste into a swee

Minchanka [31]

Answer:

a) .033 b) .4678 c) 100

Step-by-step explanation:

Distribution of miraculin produced is normal. To answer question we need to find the z-score of 100g, 110g and 120g miraculin

General formula for z score is given by

z= $\frac{X-M}{s}$ where

X is the miraculin produced (120,110,100)
M is the mean miraculin produced for a partucilar tomato plant, which is 105.3
s is the standard deviation of the sample, which is 8.0

z-score for 120 g miraculin is $\frac{120-105.3}{8}$ =1.8375 then

P(x > 120) = P(z>1.8375) = 0.033

z-score for 110 g miraculin is $\frac{110-105.3}{8}$ = 0.5875

z-score for 100 g miraculin is $\frac{100-105.3}{8}$ = -0,6625

P(100 < x < 110) = P(x>100) - P(x>110) =0.7462 - 0,2784 = 0.4678

if P(x < a) = 0.25 then corresponding z score for a is -0.6745. From the above formula we can calculate a:

$\frac{a-105.3}{8}$ =-0.6625 which gives a= 100

8 0

4 years ago