1 . In a football match , eight players take penalty kicks one by one . The table below shows the ball speed of each penalty kick :
Player Ball Speed Player Ball Speed Abraham Berg Clyne Denayer
1
80 kmh � Essien
1
76 kmh � Flores
1
100 kmh � Gana
1
66 kmh � Harry
40 kmh �1 116 kmh �1 90 kmh �1 76 kmh �1
( a ) Find the mean ball speed .
( b ) Write down
[ 2 ]
( i ) the median speed ;
( ii ) the standard deviation of the speeds ;
( iii ) the range of the speeds . [ 3 ]
© SE Production Limited 2 All Rights Reserved 2021