Answer:
a

b

Step-by-step explanation:
From the question we are told that
The data is 87 91 86 82 72 91 60 77 80 79 83 96
Generally the point estimate for the mean is mathematically represented as

=> 
=>
Generally the point estimate for the standard deviation is mathematically represented as

=> 
=> 
Answer:
1
Step-by-step explanation:
i think
Answer:
Can you take picture, please?
Answer:
4 - x
Step-by-step explanation:
product means multiply
the product of 1 and x = 1 × x = x
This is then subtracted ( minus ) from 4 giving
4 - x ← expression representing the situation
4.8 * 0 is the scientific notation