Astudent earned grades of 84, 78, 84, and 72 on her four regular tests. she earned a grade of 78 on the final exam and 86 on her class projects. her combined homework grade was 87. the four regular tests count for 40% of the course grade, the final exam counts for 30%, the project counts for 10%, and homework counts for 20%. what is her weighted mean grade? round to one decimal place.

The weighted mean grade is 81.2%.

Step-by-step explanation:

A student earned grades of 84, 78, 84, and 72 on her four regular tests.

She earned a grade of 78 on the final exam and 86 on her class projects.

Her combined homework grade was 87.

The four regular tests count for 40% of the course grade, the final exam counts for 30%, the project counts for 10%, and homework counts for 20%.

So, weighted mean grade can be calculated as :

=>

=> = 81.2

Therefore, the weighted mean grade is 81.2%.

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles