Delow shows the price and weightage for three materials P, Q and R in the year 2018 based on the year 2016. PLA
Material
P
Q
R
Price index
80
130
140
Weightage
у
Given the composite index for material P and Q in the year 2018 based on the year 2016 is
120 whereas the composite index for materials P and R is 125. Determine the ratio x:y:z.
The price index for
X
Z​

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

Will mark brainliest! ( explain the answer too, it can be one sentence)

Assume that females have pulse rates that are normally distributed with a mean of mu equals 72.0 beats per minute and a standard deviation of sigma equals 12.5 beats per minute. complete parts (a) through (c) below. a. if 1 adult female is randomly selected, find the probability that her pulse rate is between 65 beats per minute and 79 beats per minute. the probability is? b. if 16 adult females are randomly selected, find the probability that they have pulse rates with a mean between 65 beats per minute and 79 beats per minute. the probability is? c. why can the normal distribution be used in part (b), even though the sample size does not exceed 30?