6 Write 89.4945 correct to (a) nearest whole number, [1] (b) two decimal places.
1 answer:
You might be interested in
Answer:
4.5 hour and 2 hour
Step-by-step explanation:
Given: The mean number of hours per day spent watching television, according to a national survey, is 3.5 hours, with a standard deviation of two hours.
To Find: If each time was increased by one hour, what would be the new mean and standard deviation.
Solution:
let the total numbers entries of hours in survey be =
each entry in survey be =
mean of survey is = =
standard deviation is = =
if each entry in survey is increased by one hour then,
each new entry in survey is =
the new mean is =
+
=
+ 1=
now,
standard deviation is
putting values,
=
=2
new mean and standard deviation are and