Student in two fifth grade classes were given the same english test. one class of 24 studmets had a mean 86, and the second class of 23 students had a mean of 85. what is the mean for the total number of students in both classes to the nearest 0.1

The mean of the total number of students is 85.5

Step-by-step explanation:

REcall that given n data points, the mean is given by

.

Let us number the students of the 24 students' class from 1 to 24 and the let us number the students of the other class from 25 to 47.

The question is to find the following

REcall the following

Then, from this equations we can deduce that

Therefore,

yes

yes yes yes

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations: